DE69826590T2 - SYNCHRONIZATION BLOCK NUMBERING OF TRICYCLE POWER SIGNALS DURING RECORDING OF SUCH SIGNALS TO A RECORDING CARRIER - Google Patents

Abstract

A specific sync block numbering is provided for the sync blocks of a trick play signal recorded on a record carrier. This trick play signal is meant for reproduction at a trick play record carrier speed other than the nominal recording speed.

Description

• – Eingangsmittel zum Empfangen des ersten und des zweiten digitalen Informationssignals,
• – Signalverarbeitungsmittel zum Verarbeiten des ersten und des zweiten digitalen Signals zu einem ersten bzw. zweiten Trickwiedergabesignal, geeignet zur Aufzeichnung in den Spuren,
• – Schreibmittel zum mit einer Schreibgeschwindigkeit des Aufzeichnungsträgers Schreiben des ersten und des zweiten Trickwiedergabesignals zum Erhalten des ersten bzw. des zweiten Trickwiedergabesegmentes an spezifischen Stellen in den genannten Spuren, wobei die Schreibmittel wenigstens einen ersten und einen zweiten Schreibkopf auf einer drehbaren Kopftrommel aufweisen, wobei der erste Kopf einen Spalt mit einem ersten Azimutwinkel hat und der zweite Kopf einen Spalt mit einem zweiten Azimutwinkel hat, der von dem ersten Azimutwinkel abweicht, wobei das erste digitale Informationssignal gemeint ist um eine Wiedergabe in einem Wiedergabegerät mit einer Trickwiedergabegeschwindigkeit zu ermöglichen, die der n₁ fachen Aufzeichnungsgeschwindigkeit entspricht, wobei das zweite digitale Informationssignal gemeint ist um eine Wiedergabe in dem genannten Wiedergabegerät mit einer Trickwiedergabegeschwindigkeit zu ermöglichen, die der n₂ fachen Aufzeichnungsgeschwindigkeit entspricht, wobei n₁ und n₂ ganze Zahlen sind, die einander nicht entsprechen und nicht 0 und 1 sind.

The present invention relates to an apparatus for recording first and second digital information signals in oblique tracks on a magnetic recording medium ( 140 ) this device comprising the following elements:

• Input means for receiving the first and second digital information signals,
• Signal processing means for processing the first and second digital signals into first and second trick play signals, respectively, suitable for recording in the tracks,
• Write means for writing at a writing speed of the record carrier writing the first and second trick play signals to obtain the first and second trick play segments, respectively, at specific locations in said tracks, the write means comprising at least first and second write heads on a rotatable head drum; first head has a nip at a first azimuth angle and the second head has a nip at a second azimuth angle that deviates from the first azimuth angle, the first digital information signal being to enable playback in a playback device at a trick play speed that is the n ₁ times the recording speed, the second digital information signal being meant to enable a reproduction in said reproducing apparatus at a trick play speed corresponding to n ₂ times the recording speed, where n ₁ and n ₂ are integers that do not correspond to each other and are not 0 and 1.

One such a recording device is known from WO 95/28/061, document D4 in the reference material.

The known device has the form of a digital video recorder for recording a digital video signal. The digital video signal can be in the form of a MPEG encoded video signal be, wherein information packets of the digital video signal in the included serial data stream of the MPEG coded video signal are. In addition to such an MPEG-coded video signal, a Trick play signal recorded in the tracks on the record carrier become. Such a trick play signal can be the same signal but reproduced with a record carrier (trick play) speed, which is different than the nominal playback speed. In general a separate data stream is recorded to allow that a trick play signal on the recording medium with such a trick play speed can be reproduced can. The trick play signal may be from the MPEG coded video signal derived, for example, by selection of I-frames from the MPEG-coded Video signal.

This Trick playback signal does not necessarily need a trick play signal being that has a relationship with the MPEG encoded video signal, but can a completely be another signal. But in the same way as the MPEG-encoded digital Video signal includes the serial data stream of the trick play signal Packages with information about the trick play signal.

The The above document describes the recording of segments with information of a plurality of trick play signals in the Tracks on a record carrier. The segments of a particular trick play signal have one certain position in the tracks, so that playback of the trick playback signal with the appropriate trick play speed is possible.

The European U.S. Patent No. 712127 describes a tape recording and playback system for digital Video data. The tape contains Tracks with areas reserved for sync blocks with Normal playback data and sync blocks with trick play data in certain places in the tracks.

It is now u. a. An object of the present invention is an improved recorder to record a number of trick play signals with a specific format on the record carrier.

The recorder according to the present invention is characterized by the characterizing part of claim 1.

The present invention is based on the recognition that a specific sync block numbering of the sync blocks in the trick play segments is required. An important feature in this regard is that the trick play signals (so-called "original") sync blocks having information of the trick play signal stored therein. The number of "original" sync blocks read in a trick play mode during a single revolution of the head drum is generally less than m ₁ . These sync blocks are numbered from a particular output count m ₀ , which is preferably zero, to a first count value. Other sync blocks in the trick play segments may be in the form of sync blocks with parity information or sync blocks that are repetitions of the "original" sync blocks. These sync blocks are also numbered, with the specific feature that the sync blocks, which have parity information and are read out during a single revolution of the head drum, have sync block numbers from said first count to a final count equal to m ₀ + m ₁ - 1 is. In the situation where there are repetitions, an "original" sync block and its repetition have the same sync block number.

The Numbering the parity sync blocks makes it possible to that one later (other) choice is made for the error correction coding performed on the respective trick play signal Recording. Another error correction coding becomes more or less sync blocks with parity information to lead, those on the record carrier to be recorded. Because the sync blocks with parity information Have sync block numbers that go up from the first count run, disturb the parity sync blocks are not the "original" sync blocks, so that is a replay based on only the original sync blocks nevertheless possible even in a playback device with a different error correction decoding than originally defined.

Farther In addition, the sync block numbers for the trick play sync blocks are in addition to the "normal" sync block numbers, which the position of the sync blocks in a track on the record carrier. The now defined sync block numbers have no relation to such positions, so that there is a freedom of storage the synchronization blocks in other places in the record carrier without the concerned Trick play disturbed becomes.

embodiments The invention are illustrated in the drawings and are in the present Case closer described. Show it:

1 a track format in a group of p tracks, where p equals 48, and the tracks across the record carrier followed by two playback heads during a first trick play mode, the record carrier speed being + 4 times nominal speed,

1a the trick play segments for only +4 times the nominal reproduction mode, in the group of 48 tracks,

2 the content of a track on the record carrier,

3 the same format as in 1 with the tracks across the record carrier followed by the two playheads during a second trick play mode, the record carrier speed being -4 times the rated speed,

3a the trick play segments only for the -4 times nominal reproduction mode in a group of 48 tracks,

4 the same format as in 1 with the tracks across the record carrier followed by the two playheads during a third trick play mode, the record carrier speed being +12 times the rated speed,

4a the trick play segments only for the +12-fold nominal reproduction mode, in the group of 48 tracks,

5 the same format as in 1 with the tracks across the record carrier followed by the two playheads during a fourth trick play mode, the record carrier speed being -12 times the rated speed,

5a the trick play segments only for the -12-fold nominal reproduction mode, in the group of 48 tracks,

6 the same format as in 1 with the tracks across the record carrier followed by the two playback heads during a fifth trick play mode, the record carrier speed being +24 times the rated speed,

6a the trick play segments only for +24 times the nominal reproduction mode, in the group of 48 tracks,

7 the same format as in 1 with the tracks across the record carrier followed by the two playheads during a sixth trick play mode, the record carrier speed being -24 times the rated speed,

7a the trick play segments only for the -24-fold nominal reproduction mode, in the group of 48 tracks,

8th the format of a synchronization block,

9 the format of the header in the sync block 8th .

10 two consecutive sync blocks in which an MPEG packet is stored,

11 the contents of the packet header in the first sync block of the two consecutive sync blocks 10 wherein the packet header has the time stamps,

12 the contents of the packet header in the first trick sync block of the two consecutive tricks sync blocks 1 wherein this packet header contains the time stamps for packets in a trick play data stream of packets,

13 an embodiment of a recording apparatus according to the present invention,

14 an embodiment of a timing generator in the device according to 13 , and

15 an embodiment of a display device.

1 shows a track format of the on the record carrier 1 recorded tracks. The tracks are recorded at an oblique angle to the longitudinal direction of the recording medium. In Fig. 1, however, the traces are, for the sake of clarity, at an angle transverse to the longitudinal direction of the recording medium 1 shown. Groups of p consecutive tracks can be on the record carrier 1 be differentiated. Such a group of p consecutive traces is in 1 , where p is 48 in the present example. During recording / playback, tracks are recorded in one direction from bottom to top and from left to right in 1 written and read.

If Now you have groups of 48 tracks, there are the following trick play speeds as a possibility: 2 ×, 3 ×, 4 ×, 6 ×, 8 ×, 12 × and 24 ×. The two lowest trick play speeds require a variety of trick play data. Furthermore, trick play speeds are preferred to select, which are whole multiples of each other. That leads to the Trick play speeds of 4 ×, 12 × and 24 ×, or 6 ×, 12 × and 24 ×. Below is the sentence with trick play speeds 4 ×, 12 ×, and 24 × and their inverse speeds described in more detail.

2 shows the format of a single track. The track is recorded and read out in a left-to-right direction in the figure. In the present example, the lengths of the respective track parts in 2 in terms of a number of main sync blocks, a main sync block having a length of 112 bytes of 8 bits each.

First, a clock inlet part 2 , referred to as "margin", which in the present example is 2 main sync blocks long. Then follows a preamble part 3 which is long 3 main sync blocks. A subcode signal recording part 4 follows the preamble part 3 and is 4 main sync blocks long. The subcode signal recording part 4 should record in itself a subcode signal. The subcode signal may include, but is not limited to, absolute and / or relative time information and a content table.

This is followed by a postamble part 5 long 3 main sync blocks, one edit gap 6 , by "IBG" which is 3 main sync blocks long and a preamble part 7 which is 1 main sync block long in the present example. Then follows an auxiliary signal recording part 8th , denoted by "AUX", which is 23 main sync blocks long. The auxiliary signal recording part 8th is used to record an auxiliary signal, such as text data. This auxiliary signal recording part 8th follows a postamble part 9 which is 2 main sync blocks long, and an edit gap 10 , denoted by "IBG", which is 3 main sync blocks long and a preamble part 11 which is 1 sync block long. This is followed by an information signal recording part 12 , denoted by "main data area", which is 307 main sync blocks long. The information signal recording part 12 should record the digital information in itself. A digital information signal may be a digital video signal and / or a digital audio signal that may be encoded into an MPEG information signal. Further, in the information signal recording part 12 Trick play data. The information signal recording part 12 is fictionally divided into two parts, a first part 12a which is 277 main sync blocks long and a second part 12b , which is long 30 main sync blocks, The second part 12b includes outer ECC parity information.

The information signal recording part 12 follows a postamble part 13 which is 2 main sync blocks long and another "margin" part 14 whose length is not relevant but can be assumed to be, for example, 2 main sync blocks long.

It should be noted at this point that the auxiliary signal recording part 8th can be arbitrary, in the sense that in another recording mode no auxiliary signal is recorded in the tracks and that the recording part 8th including the parts 9 . 10 and 11 to the information signal recording part 12 and filled with main information, but without trick play data.

Based on 1 becomes the content of the first part 12a of the information signal recording part 12 described in more detail. 1 shows tracks that have been recorded using at least a first and a second write head. The first head has a nip with a first azimuth angle and the second head has a nip with a second azimuth angle that is different than the first azimuth angle. The tracks recorded by the first write head are indicated by the oblique line extending from the lower left corner of the figure to the upper right corner of the figure, and the tracks recorded by the second write head are indicated by the oblique line different from the one shown in FIG right lower corner of the figure extends to the upper left corner of the figure, see the circle in 1 with the reference number 20 ,

The first information signal, which may contain information packets of an MPEG transport stream, is recorded in the tracks, particularly in the information signal recording parts 12 of the tracks. In an embodiment of the recording apparatus which is in the form of a helical-scan type digital VTR, the first information signal may be "normal reproduction" data recorded in the tracks for reproduction in a reproducing apparatus at a recording medium speed corresponding to the recording medium velocity during recording. This speed is defined as the nominal record carrier speed. The first information signal is accommodated in the main sync blocks defined above.

Furthermore, a second information signal has been recorded in certain segments in the tracks. These segments are in 1 by the reference numerals 22.1 (+4) where i is from 1 to 12. This second information signal is meant to be reproduced in a reproducing apparatus at a reproduction speed equal to 4 times the nominal reproduction speed in the forward direction. This second information signal could be an information signal having no relation whatsoever with the first information signal introduced above. The second information signal could have a relationship with the first information signal. Namely, in the sense that the second information signal is a trick play signal for 4 times the nominal reproduction speed to obtain a reproduced (video) signal which is a replica of the reproduced first (video) signal but reproduced at 4 times the rated speed in the forward direction.

1a shows the same group with 48 tracks as 1 but only the 12 segments 22.i (+4) are in 1a shown. Assuming now that the track number of the first track in the group of 48 tracks is Track No. 0 and that the track number of the last track in the group is Track No. 47, then the segments in the tracks having track number 2 become + nx8 and 5 + nx8, where n is an integer running from 0 through 5 inclusive.

1 also shows four scan lines 24.1 . 24.2 . 26.1 and 26.2 , the scan lines 24.1 and 24.2 with double-headed arrows, the distances followed by the one head with the first azimuth angle over the record carrier during two revolutions of the head drum in the fourfold nominal reproduction mode. The single-headed scan lines 26.1 and 26.2 Fig. 10 shows the distances followed by the other head with the second azimuth angle across the record carrier in the four times nominal reproduction mode during said two revolutions of the head drum. How out 1 As can be seen, one head reads the trick play segments 22.i (+4) where i is odd, and the other head thus reads the trick play segments 22.i (+4) where i is even.

The trick play segments 22.i (+4) have in the present example, each have a length of _(m1 / 2 =) 50 main sync blocks. Of the fifty main sync blocks in a single segment, 45 sync blocks have information content with respect to the trick play information stored in these sync blocks, which could include "dummy" sync blocks, which will be described later. The other five sync blocks in a segment include parity information obtained from an ECC encoding step performed on the trick play information. In this way, during each revolution of the head drum during a four times nominal reproduction mode, 100 sync information blocks of the second information signal containing 10 sync blocks with parity information are read from the information carrier.

When numbering the main sync blocks, starting from 0, which is the first sync block in the auxiliary record area 8th in the track, until 305, which is the last sync block in the area 12a the track is the sync blocks in the segments 22.i (+4) where i is even, the sync blocks numbered 87 through 136 inclusive in a track, where sync blocks numbered 132 through 136 are the sync blocks with the parity information. Furthermore, the sync blocks are in the segments 22.i (+ 4) where i is odd, the sync blocks numbered 206 through 255 inclusive in one track, again the sync blocks numbered 251 through 255 are the sync blocks with the parity information. It should be noted at this point that what is referred to herein as a sync block number for the trick play sync blocks, these numbers are numbers other than what is hereinafter referred to and described as "trick play sync block numbers" for the same trick play sync blocks.

1a still shows parts with the number 22:13 (+4) to 22:18 (+4) , at the bottom of some tracks in the group of 48 tracks. These digits are digits that can be read out in the present case in the + 4-times nominal rendition mode from one of the two heads, with the head having the first azimuth. Since the illustrated digits include the subcode signal reproducing part, it is possible to read out the information in the subcode signal recording part, even in the +4 times nominal reproduction mode.

3 shows a third information signal recorded in specific segments in the tracks. These segments are in 3 by the reference numerals 28.i (-4) where i is from 1 to 24. This third information signal is meant to be reproduced in a reproducing apparatus at a reproduction speed equal to 4 times the nominal reproduction speed in the reverse direction. This third information signal may be an information signal having no relation whatsoever with the first and / or second information signals introduced above. The third information signal could have a relationship with the first information signal in the sense that the third information signal is a trick play signal for the -4 times the nominal reproduction speed to obtain a reproduced (video) signal representing a replica of the reproduced first (FIG. Video) signal, but reproduced at -4 times the rated speed (in the reverse direction).

3a shows the same group of 48 tracks as 3 but only the 24 segments 28.i (-4) are in 3a shown. It is now assumed that the track number of the first track in the group of 48 tracks is the track No. 0 and the track number of the last track in the group is the track number 47 that the segments in the tracks with the track number 1 + nx8, 3 + nx8, 4 + nx8 and 6 + nx8 where n is an integer from 0 to 5, inclusive.

3 also shows four scan lines 30.1 . 30.2 . 32.1 and 32.2 , The double-headed scan lines 30.1 and 30.2 The distances followed by the one head with the first azimuth angle, over the record carrier in the -4-times nominal reproduction mode in two revolutions of the head drum. The one-arrow scan lines 32.1 and 32.2 show the distances that the other head with the second azimuth angle over the record carrier in the -4-fold nominal reproduction mode in the two mentioned turns of the head drum follows. As in 3 As can be seen, one head reads the trick play segments 28.i (-4) where i equals 3, 4, 7, 8, 11, 12, 15, 16, 19, 20, 23 and 24 and the other head reads the trick play segments 28.j (-4) where j is 1, 2, 5, 6, 9, 10, 13, 14, 17, 18, 21 and 22.

The trick play segments 28.i (-4) each having a length of _(m1 / 4 =) 25 main sync blocks. A trick play segment for the 4-times trick play speed comprises either 22 sync blocks having information content relating to the trick play information stored in these sync blocks and the parity information sync blocks or 23 sync blocks each having information content with respect to the trick play information stored in these sync blocks and two parity information sync blocks , Again, the parity information stored in the sync blocks with the parity information is obtained from an ECC encoding step performed on the trick play signal.

The trick play segments for the -4 times the nominal reproduction speed can be realized as explained in the following example. In the numbering of the main sync blocks, starting from 0, which is the first sync block in the auxiliary record area 8th in a track, until 305, which is the last sync block in the area 12a in the track is the sync blocks in the segments 28.i (-4) , where i equals 2, 6, 10, 14, 18, and 22, the sync blocks numbered 51 through 75 in a track, with sync blocks numbered 74 and 75 being the sync blocks with the parity information. Furthermore, the sync blocks are in the segments 28.j (-4) where j equals 4, 8, 12, 16, 20, and 24, the sync blocks numbered 122 through 146 are in one track, with sync blocks numbered 145 and 146 being the sync blocks with the parity information. The sync blocks in the segments 28.k (-4) where k equals 1, 5, 9, 13, 17, and 21 are the sync blocks numbered 194 through 218 in a track, with sync blocks numbered 216, 217, and 218 being the sync blocks with the parity information. Furthermore, the sync blocks are in the segments 28.1 (-4) , where 1 equals 3, 7, 11, 15, 19, and 23, the sync blocks numbered 265 through 289 in a track, with sync blocks numbered 287, 288, and 289 being the sync blocks with the parity information.

On this way will be during each revolution of the head drum in a -4-fold nominal reproduction mode 100 sync blocks with information of the third information signal (2 × 22 + 2 × 23 + 10 sync blocks) the record carrier read. This is the same number of trick play sync blocks as for the 4 times playback mode.

3a still shows parts with the number 28.25 (-4) to 28.29 (-4) at the bottom of some tracks in the group of 48 tracks. These locations are digits that can be read out in the present case from one of the two heads in the -4-times nominal display mode, this head having the first azimuth angle. Since the illustrated digits have the subcode signal recording part, it is possible to read out the information in the subcode signal recording part, even in the -4-times nominal reproduction mode.

4 shows a fourth information signal recorded in certain segments in the tracks. These segments are in 4 by the reference numerals 34.i (+12) where i is from 1 to 16. This fourth information signal is meant to be reproduced in a display device at a playback speed equal to 12 times the nominal playback speed in the forward direction. This fourth information signal could be an information signal having no relation whatsoever to the first and / or second and / or third information signals introduced above. The fourth information signal may have a relationship with the first information signal, in the sense that the fourth information signal is a trick play signal for 12 times the nominal reproduction speed in the forward direction to obtain a reproduced (video) signal representing a replica of the reproduced one first (video) signal, but reproduced at 12 times the rated speed (in the forward direction).

4a shows the same group of 48 tracks as 4 but only the 16 segments 34.j (+12) are in 4a shown. Assuming now that the track number of the first track in the group of 48 tracks is the track number 0 and the track number of the last track in the group is the track number 47, the segments in the tracks having the track number 3 + nx2, 14 + nx2, 27 + nx2 and 38 + nx2 where n is an integer from 0 to 3, inclusive.

4 also shows four scan lines 36.1 . 36.2 . 37.1 and 37.2 , The verse with a double arrow scan lines 37.1 and 37.2 show the distances followed by the one head with the first azimuth angle across the record carrier in the +12 times nominal reproduction mode in two turns of the head drum. The single-headed scan lines 36.1 and 36.2 Fig. 10 shows the distances followed by the other head with the second azimuth angle across the record carrier in the + 12-times nominal reproduction mode in said two revolutions of the head drum. As in 4 As can be seen, one head reads the trick play segments 34.i (+12) where i is equal to 1 through 4 and 9 through 12 inclusive, and the other head consequently reads the trick play segments 34.j (+12) where j is 5 through 8 and 13 through 16 inclusive.

There are trick play segments 34.i (+12) having a length of ((m ₂ - 4) / 8 =) 22 main sync blocks and trick play segments 34.i (+12) which have a length of ((m ₂ + 12) / 8 =) 24 sync blocks. A trick play segment with a length of 22 sync blocks comprises 11 sync blocks with information content related to the trick play information stored in these sync blocks, and 11 sync blocks which are a repeat of each of the 11 sync blocks. A trick play segment having a length of 24 sync blocks comprises 12 sync blocks having information content related to the trick play information stored in these sync blocks, and further 12 sync blocks being a repeat of each of the 12 sync blocks.

The trick play segments for the +12 times nominal reproduction speed can be realized as explained in the following example. Here too, if the main sync blocks are numbered, starting from 0, which is the first sync block in the auxiliary record area 8th in a track, until 305, which is the last sync block in the area 12a in the track are the trick play sync blocks in the segments 34.1 (+12) and 34.9 (+12) the sync blocks numbered 76 to 99 inclusive in a track, with sync blocks numbered 88 to 99 inclusive being replicates of sync blocks numbered 76 to 87, inclusive. Furthermore, the trick play sync blocks are in the segments 34.2 (+12) and 34.10 (+12) the sync blocks numbered 141 to 162 inclusive in a track, with sync blocks numbered 152 to 162 inclusive repeating the sync blocks numbered 141 up to and including 151 are. The trick rep to sync blocks in the segments 34.3 (+12) and 34.11 (+12) are the sync blocks numbered 206 through 227 in a track, with sync blocks number 217 through 227 being repeats of sync blocks numbered 206 through 216 inclusive. Furthermore, the trick play sync blocks 34.4 (+12) and 34.12 (+12) the sync blocks numbered 271 through 292 in a track, where the sync blocks numbered 282 through 292 are repeats of sync blocks numbered 271 through 281 inclusive.

The trick play sync blocks in the segments 34.5 (+12) and 34.13 (+12) are the sync blocks numbered 44 to 67 inclusive in a track, with sync blocks numbered 56 to 67 inclusive being repetitions of sync blocks numbered 44 to 55, inclusive. Furthermore, the trick play sync blocks are in the segments 34.6 (+12) and 34.14 (+12) the sync blocks numbered 109 through 130 inclusive in a track, where sync blocks numbered 120 through 130 are repeats of sync blocks numbered 109 through 119 inclusive. The trick play sync blocks in the segments 34.7 (+12) and 34.15 (+12) are the sync blocks numbered 174 through 195 in a track, with sync blocks numbered 185 through 195, respectively, being repeats of sync blocks numbered 174 through 184 inclusive. Furthermore, the trick play sync blocks are in the segments 34.8 (+12) and 34.16 (+12) the sync blocks numbered 239 through 260 inclusive in a track, where sync blocks numbered 250 through 260 are repeats of sync blocks numbered 239 through 249 inclusive.

In this way, each revolution of the head drum will be in a +12 times nominal reproduction mode 180 Sync blocks (6 × 22 + 2 × 24 sync blocks) of the fourth information signal are read from the record carrier.

4a also shows parts numbered 34.17 (+12) and 34.18 (+12) at the bottom of some tracks in the group of 48 tracks. These digits are digits that can be read from the head at the first azimuth angle in the +12 times nominal rendering mode of one of the two heads, in this example. Since the illustrated digits contain the subcode signal recording part, it is possible It is also possible to read out the information in the subcode signal recording part in the + 12-times nominal reproduction mode.

5 shows a fifth information signal recorded in certain segments in the tracks. These segments are in 5 by the reference numerals 40.i (-12) where i is from 1 to 18. This fifth information signal is meant for reproduction in a display device at a playback speed equal to -12 times the nominal playback speed (ie: in the backward direction). This fifth information signal could be an information signal having no relation at all with the first and / or the second and / or the third and / or the fourth information signal introduced above. The fifth information signal could have a relationship with the first information signal, in the sense that the fifth information signal is a trick play signal for the -12 times nominal playback speed, to obtain a reproduced (video) signal representing a replica of the reproduced first (FIG. Video) signal, but reproduced at -12 times the rated speed (in the reverse direction).

5a shows the same group of 48 tracks as 5 but only the 18 segments 40.i (-12) are in 5a shown. Assuming now that the track number of the first track in the group of 48 tracks is the track number 0 and that the track number of the last track in the group is the track number 47, then the segments in the tracks having the track number become 3+ nx2 and 27 + nx2, where n is an integer Zah1 from 0 to 3, and in the tracks having the track number 14 + nx2 and 38 + nx2, where n is an integer from 0 to 4 inclusive.

5 still shows only two scan lines 42 and 44 , The double-headed scan line 42 Fig. 12 shows the distance which the one head, with the first azimuth angle, follows over the record carrier in the -12 times nominal reproduction mode in a single revolution of the head drum. The single-headed scan line 44 Fig. 10 shows the distance which the other head with the second azimuth angle follows over the record carrier in the -12-fold nominal reproduction mode in said one revolution of the head drum. As in 5 As can be seen, one head reads the trick play segments 40.i (-12) where i equals 5 through 9 inclusive (and also 14 through 18 inclusive), and the other head thus reads the trick play segments 40.j (-12) where j is 1 to 4 and 10 to 13 inclusive.

The trick play segments 40.i (-12) each have a length of 20 main sync blocks, each trick play segment 10 Sync blocks containing information content relating to the trick play information stored in these sync blocks and further comprising 10 sync blocks which are a repeat of each of the 10 sync blocks.

The trick play segments for the -12 times nominal reproduction speed can be realized as explained in the following example. When the main sync blocks are numbered again starting from 0, which is the first sync block in the sub record area 8th in a track, until 305, which is the last sync block in the area 12a in the track, the sync blocks are in the segments 40.5 (-12) and 40.14 (-12) the sync blocks numbered 30 to 49 inclusive in a track, where the sync blocks numbered 40 to 49 inclusive are repetitions of sync blocks numbered 30 to 39, inclusive. Furthermore, the sync blocks in the segments, 40.1 (-12) and 40.10 (-12) the sync blocks numbered 57 through 76 inclusive in a track, where sync blocks numbered 67 through 76 are repeats of sync blocks numbered 57 through 66 inclusive. The sync blocks in the segments 40.6 (-12) and 40.15 (-12) are the sync blocks in a track numbered 85 through 104 inclusive, with sync blocks numbered 95 through 104 being replicates of sync blocks numbered 85 through 94 inclusive. Furthermore, the sync blocks are in the segments 40.2 (-12) and 40.11 (-12) the sync blocks in a track numbered 112 to 131 inclusive, with sync blocks numbered 122 to 131 inclusive being repeats of sync blocks numbered 112 to 121, inclusive.

The sync blocks in the segments 40.7 (-12) and 40.16 (-12) are the sync blocks in a track numbered 139 through 158 inclusive, with sync blocks numbered 149 through 158 being repetitions of sync blocks numbered 139 through 148 inclusive. Furthermore, the sync blocks are in the segments 40.3 (-12) and 40.12 (-12) the sync blocks in a track numbered 167 through 186, with sync blocks numbered 177 through 186 repeats of the sync blocks with the number Number 167 through 176 are. The sync blocks in the segments 40.8 (-12) and 40.17 (-12) are the sync blocks in a track numbered 194 through 213, with sync blocks numbered 204 through 213 being repeats of sync blocks numbered 194 through 203, respectively. Furthermore, the synchronization blocks are in the segments 40.4 (-12) and 40.13 (-12) the sync blocks in a track numbered 222 through 241 inclusive, where the sync blocks numbered 232 through 241 are repeats of sync blocks numbered 222 through 231 inclusive. At least the sync blocks in the segments 40.9 (-12) and 40.18 (-12) are the sync blocks numbered 249 through 268, with sync blocks numbered 259 through 268 being repeats of sync blocks numbered 249 through 258 inclusive.

In this way, during each revolution of the head drum in a -12 times the nominal reproduction mode 180 Sync blocks (9 x 20 sync blocks) with information of the fifth information signal are read from the record carrier, which is the same number of sync blocks as for the + 12-times playback mode.

5a still shows parts with the number 40.19 (-12) and 40.20 (-12) at the bottom of some tracks in the group of 48 tracks. These digits are digits that can be read out in one-two-fold nominal rendition mode from one of the two heads, in the present case, the head at the first azimuth angle. Since the illustrated digits include the subcode signal recording part, it is possible to read the information in the subcode signal recording part also in the -12 times nominal reproduction mode.

6 shows a sixth information signal recorded in certain segments in the tracks. These segments are in 6 by the reference numerals 48.i ((+ 24) where i is from 1 to 18. This sixth information signal is intended for reproduction in a display device at a playback speed equal to +24 times the nominal playback speed (ie: in the forward direction). This sixth information signal could be an information signal having absolutely no relation with the first and / or the second and / or the third and / or the fourth and / or the fifth information signal introduced above. The sixth information signal may have a relationship with the first information signal in the sense that the sixth information signal is a + 24 times nominal playback speed trick play signal to obtain a reproduced (Vi deo) signal representing a replica of the reproduced first (Video) signal is, but reproduced at +24 times the rated speed.

6a shows the same group of 48 tracks as 6 but only the 18 segments 48.i (+24) are in 6a shown. Assuming now that the track number of the first track in the group of 48 tracks is the track number 0 and the track number of the first track in the group is the track number 47, then the segments in the tracks having the track number 4 + nx2 and 27 + nx2, where n is an integer from 0 through 8 inclusive.

6 also shows two scan lines 50 and 51 , The double-headed scan line 50 Fig. 10 shows the distance followed by the one head with the first azimuth angle over the record carrier in the +24 times nominal reproduction mode in one revolution of the head drum. The one-arrow scan line 51 Fig. 12 shows the distance which the other head with the second azimuth angle follows over the record carrier in the + 24-fold nominal reproduction mode in said one revolution of the head drum. As in 6 As can be seen, one head reads the trick play segments 48.i (+24) where i equals 1 through 9 inclusive, and the other head thus reads the trick play segments 48.j (+24) where j is 10 to 18 inclusive.

The trick play segments 48.i (+24) each have a length of 15 main sync blocks, each segment having 3 sync blocks with information content related to the trick play information stored in these sync blocks, and further these 5 sync blocks are repeated twice each.

The trick play segments for +24 times the nominal reproduction speed can be realized as explained in the following example. Returning to the numbering of the main sync blocks, starting from 0, the first sync block in the auxiliary record area 8th in a track, until 305, which is the last sync block in the area 12a in the track, the sync blocks are in the segments 48.10 (+24) the sync blocks in a track with the number 29 through 43 inclusive, where the sync blocks numbered 34 through 38 and 39 through 43 are repeats of the sync blocks 29 through 33 inclusive. The sync blocks in the segment 48.1 (+24) are the sync blocks in a track numbered 43 to 57 inclusive, with sync blocks numbered 48 through 52 and 53 through 57 inclusive repeats of sync blocks numbered 43 through 47 inclusive. The sync blocks in the segment 48.11 (+24) are the sync blocks in a track numbered 60 through 74 inclusive, with sync blocks numbered 65 through 69 and 70 through 74 inclusive of repetitions of sync blocks 60 through 64 inclusive. The sync blocks in the segment 48.2 (+24) are the sync blocks in a track numbered 74 through 88 inclusive, where sync blocks numbered 79 through 83 and 84 through 88 inclusive are repetitions of sync blocks numbered 74 through 78, inclusive. The sync blocks in the segment 48.12 (+24) are the sync blocks in a track numbered 91 to 105 inclusive, with sync blocks numbering 96 to 100 inclusive and 101 to 105 inclusive being repetitions of sync blocks 91 through 95 inclusive. The sync blocks in the segment 48.3 (+24) are the sync blocks in a track numbered 105 through 119 inclusive, where sync blocks numbered 110 through 114 inclusive and sync blocks 115 through 119 are replicates of sync blocks numbered 105 through 109 inclusive. Furthermore, the sync blocks are in the segment 48.13 (+24) the sync blocks in a track numbered 122 through 136 inclusive, where sync blocks numbered 127 through 131 inclusive and 132 through 136 are repetitions of sync blocks 122 through 126 inclusive. The sync blocks in the segment 48.4 (+24) are the sync blocks in a track numbered 136 through 150 inclusive, where sync blocks numbered 141 through 145 and sync blocks 146 through 150 are repetitions of sync blocks numbered 136 through 140 inclusive.

The sync blocks in the segment 48.14 (+24) are the sync blocks in a track numbered 153 through 167, with sync blocks numbered 158 through 162, and sync blocks numbered 163 through 167 are repetitions of sync blocks numbered 153 through 157, respectively. The sync blocks in the segment 48.5 (+24) are the sync blocks in a track numbered 167 through 181, with sync blocks numbered 172 through 176 and 177 through 181 inclusive, are repeats of sync blocks numbered 167 through 171, respectively.

The sync blocks in the segment 48.15 (+24) are the sync blocks in a track numbered 184 through 198, with sync blocks numbered 189 through 193 and sync blocks numbered 194 through 198, respectively, with repetitions of sync blocks numbered 184 through 188 inclusive. The sync blocks in the segment 48.6 (+24) are the sync blocks in a track numbered 198 through 212 inclusive, where sync blocks numbered 203 through 207 and 208 through 212 are repeats of sync blocks numbered 198 through 202, inclusive.

The sync blocks in the segment 48.16 (+24) are the sync blocks in a track numbered 215 through 229, with sync blocks numbered 220 through 224 and sync blocks numbered 225 through 229, respectively, are repeats of sync blocks numbered 215 through 219 inclusive. The sync blocks in the segment 48.7 (+24) are the sync blocks in a track numbered 229 through 243, with sync blocks numbered 234 through 238, and 239 through 243 inclusive, are repetitions of sync blocks numbered 229 through 233, respectively.

The sync blocks in the segment 48.17 (+24 ) are the sync blocks in a track numbered 246 through 260 inclusive, where sync blocks numbered 251 through 255 and sync blocks numbered 256 through 260 are repeats of sync blocks numbered 146 through 250 inclusive. The sync blocks in the segment 48.8 (+24) are the sync blocks in a track numbered 260 through 274 inclusive, with sync blocks numbered 265 through 269 and 270 through 274 inclusive are repetitions of sync blocks numbered 260 through 264 inclusive.

The sync blocks in the segment 48.18 (+24) are the sync blocks in a track numbered 277 to 291 inclusive, with sync blocks numbered 282 to including 286 and the sync blocks numbered 287 through 291 are repetitions of sync blocks numbered 277 through 281 inclusive. The sync blocks in the segment 48.9 (+24) are the sync blocks in a track numbered 291 through 305, with sync blocks numbered 296 through 300, and 301 through 305 inclusive, are repetitions of sync blocks numbered 291 through 295 inclusive.

In this way, during each revolution of the head drum, in a +24 times nominal reproduction mode 270 Synchronization blocks (18 × 15 sync blocks) with information of the sixth information signal read from the record carrier.

6a also shows a part with the number 48.19 (+24) at the bottom of one of the tracks in the group of 48 tracks. This location is a location that can be read out in one of the two heads, in the present case the head with the first azimuth angle, in the +24 times nominal display mode. Since the position shown has the subcode signal recording part, it is possible to read out the information in the subcode signal recording part also in the +24 times nominal reproduction mode.

7 shows a seventh information signal recorded in certain segments in the tracks. These segments are in 7 by the reference numeral 54.i (-24) where i is from 1 to 18. This seventh information signal is intended for reproduction in a display device at a playback speed equal to -24 times the rated playback speed (ie, in the reverse direction). This seventh information signal could be an information signal having absolutely no relation with the first and / or the second and / or the third and / or the fourth and / or the fifth and / or the sixth information signal introduced above. The seventh information signal could have a relationship with the first information signal in the sense that the seventh information signal is a trick play signal for the -24 times nominal playback speed to obtain a reproduced (video) signal representing a replica of the reproduced first (FIG. Video) signal, but reproduced at -24 times the rated speed (ie in the reverse direction).

7a shows the same group of 48 tracks as 7 but only the 18 segments 54.i (-24) are in 7a shown. Assuming that the track number of the first track in the group of 48 tracks is the track No. 0 and the track number of the last track in the group is the track No. 47, the segments in the tracks having the track number become 1 + nx2 , 24 + nx2 and 34 + nx2, where n is an integer from 0 through 4 inclusive, and tracks 11, 15 and 17.

7 also shows two scan lines 58 and 56. The double-headed scan line 56 shows the path followed by the one head at the first azimuth angle across the record carrier in the -24-fold nominal playback mode during one revolution of the head drum. The single-headed scan line 58 shows the path followed by the other head at the second azimuth angle across the record carrier in the -24-fold nominal playback mode during said one revolution of the head drum. As in 7 Obviously, one head reads the trick play segments 54.i (-24) where 1 equals 1 through 8 inclusive, and the other head thus reads the trick play segments 54.j (-24) where j is 9 to 18 inclusive.

The trick play segments 54.i (-24) each have a length of 15 main sync blocks, each segment having 5 sync blocks with information about the trick play information stored in these sync blocks, and further these 5 sync blocks are repeated twice each.

The trick play segments for the -24 times the nominal reproduction speed can be realized as explained in the following example. When the main sync blocks are numbered, starting from 0, which is the first sync block in the auxiliary record area 8th in a track, until 305, which is the last sync block in the area 12a in the track, the sync blocks are in the segment 54.9 (-24) the sync blocks in a track numbered 29 through 43 inclusive, where the sync blocks numbered 34 through 38 and 39 through 43 inclusive are repetitions of the sync blocks 29 through 33 inclusive. The sync blocks in the segment 54.1 (-24) are the sync blocks in a track numbered 43 to 57 inclusive, with sync blocks numbered 48 to 52 inclusive and 53 to 57 inclusive are repetitions of sync blocks numbered 43 to and including 47. The sync blocks in the segment 54.10 (-24) are the sync blocks in a track number 57 through 71 inclusive, with sync blocks numbered 62 through 66 inclusive and 67 to 71 inclusive are repetitions of the sync blocks 57 to 61 inclusive. The sync blocks in the segment 54.2 (-24) are the sync blocks in a track numbered 71 through 85 inclusive, where sync blocks 76 through 80 and 81 through 85 inclusive are repetitions of sync blocks numbered 71 through 75 inclusive. The sync blocks in the segment 54.11 (-24) are the sync blocks in a track numbered 86 to 100 inclusive, with sync blocks numbered 91 to 95 inclusive and 96 to 100 inclusive repeats of sync blocks 86 through 90 inclusive. The sync blocks in the segment 54.3 (-24) are the sync blocks in a track numbered 128 through 142 inclusive, with sync blocks numbered 133 through 137, and sync blocks 138 through 142, respectively, are repeats of sync blocks numbered 128 through 132 inclusive. Furthermore, the sync blocks are in the segment 54.12 (-24) the sync blocks in a track numbered 114 through 128 inclusive, where sync blocks numbered 119 through 123 and 124 through 128 inclusive are repetitions of sync blocks 114 through 118 inclusive. The sync blocks in the segment 54.4 (-24) are the sync blocks in a track numbered 157 through 171, with sync blocks numbered 162 through 166 inclusive, and sync blocks 167 through 171 are repeats of sync blocks numbered 157 through 161, respectively.

The sync blocks in the segment 54.13 (-24) are the sync blocks in a track numbered 143 through 157, with sync blocks numbered 148 through 152 and sync blocks numbered 153 through 157 repeating sync blocks numbered 143 through 147 inclusive. The sync blocks in the segment 54.5 (-24) are the sync blocks in a track numbered 185 to 199 inclusive, with sync blocks numbered 190 to and including 194 and 195 to and including 199 repetitions of sync blocks numbered 185 to 189 inclusive.

The sync blocks in the segment 54.14 (-24) are the sync blocks in a track numbered 171 through 185 inclusive, where sync blocks numbered 176 through 180 and sync blocks numbered 181 through 185 are repeats of sync blocks numbered 171 through 175, respectively. The sync blocks in the segment 54.6 (-24) are the sync blocks in a track number 214 through 228 inclusive, with sync blocks number 219 through 223 and 224 through 228 inclusive being repeats of sync blocks number 214 through 218 inclusive.

The sync blocks in the segment 54.15 (-24) are the sync blocks in a track numbered 200 through 214 inclusive, where sync blocks numbered 205 through 209 and sync blocks numbered 210 through 214 are repeats of sync blocks numbered 200 through 204 inclusive. The sync blocks in the segment 54.7 (-24) are the sync blocks in a track numbered 242 through 256 inclusive, where sync blocks numbered 247 through 251 and 252 through 256 are repeats of sync blocks numbered 242 through 246 inclusive.

The sync blocks in the segment 54.16 (-24) are the sync blocks in a track numbered 228 through 242, with sync blocks numbered 233 through 237 and sync blocks numbered 238 through 242, respectively, are repeats of sync blocks numbered 228 through 232, respectively. The sync blocks in the segment 54.8 (-24) are the sync blocks in a track numbered 271 through 285, with sync blocks numbered 276 through 280, and 281 through 285 inclusive, including 285 repeats of sync blocks numbered 271 through 275 inclusive.

The sync blocks in the segment 54.17 (-24) are the sync blocks in a track numbered 257 through 271, with sync blocks numbered 262 through 266 and sync blocks numbered 267 through 271, respectively, are repeats of sync blocks numbered 257 through 261 inclusive. The sync blocks in the segment 54.18 (-24) are the sync blocks in a track numbered 285 to 299 inclusive, with sync blocks numbered 290 to 294 inclusive and 295 to 299 inclusive are repetitions of sync blocks numbered 285 to 289 inclusive.

In this way, during each revolution of the head drum in a -24 times nominal again In this way, 270 sync blocks (18 × 15 sync blocks) with information of the seventh information signal are read from the record carrier, which is the same number of sync blocks as in the +24-times playback mode.

7a also shows a part with the number 54.19 (-24) at the bottom of one of the tracks in the group of 48 tracks. The location is a location that can be read in the -24 times nominal mode of expression from one of the two heads, in the present case the head with the second azimuth angle. Since the position shown has the subcode signal recording part, it is possible to read out the information in the subcode signal recording part also in the -24 times nominal reproduction mode.

The Trick play sync blocks for each of those described above respective trick play modes have their own trick play sync block numbering. The trick play sync block numbering now described is, therefore, is different than the numbers used above to identify the exact locations of the respective segments in a track.

• (a) für die Trickwiedergabegeschwindigkeiten +4-fach Nenngeschwindigkeit und –4-fach Nenngeschwindigkeit werden insgesamt 100 Trickwiedergabesynchronisationsblöcke in jeder Umdrehung der Kopftrommel ausgelesen, d. h. 90 Synchronisationsblöcke mit Information über die betreffenden Trickwiedergabesignale und 10 Synchronisationsblöcke mit Paritätsinformation. Diese 90 Trickwiedergabesynchronisationsblöcke sind von 0 bis einschließlich 89 nummeriert, in der Reihenfolge, in der sie während einer Umdrehung der Kopftrommel in der Trickwiedergabemode ausgelesen werden, wobei der Trickwiedergabesynchronisationsblock 0 der erste Trickwiedergabesynchronisationsblock ist, der von dem Kopf mit dem ersten Azimutwinkel ausgelesen wird. Die 10 Paritätssynchronisations blöcke von 90 bis 99 nummeriert, in der Reihenfolge, in der sie während einer Umdrehung der Kopftrommel ausgelesen werden, wobei der Trickwiedergabesynchronisationsblock 90 der erste Trickwiedergabesynchronisationsblock mit Paritätsinformation ist, der von dem Kopf mit dem ersten Azimutwinkel ausgelesen wird.
• (b) für die Trickwiedergabegeschwindigkeiten +12-fach Nenngeschwindigkeit und –12-fach Nenngeschwindigkeit werden insgesamt 180 Trickwiedergabesynchronisationsblöcke während jeder Umdrehung der Kopftrommel ausgelesen, d. h. zweimal 90 Trickwiedergabesynchronisationsblöcke, da jedes Trickwiedergabesegment eine Anzahl von 90 Trickwiedergabesynchronisationsblöcken und eine Wiederholung jedes dieser 90 Trickwiedergabesynchronisationsblöcke enthält. Diese 90 Trickwiedergabesynchronisationsblöcke sind wieder von 0 bis einschließlich 89 nummeriert, und zwar in der Reihenfolge, in der sie während der genannten einen Umdrehung des Kopfes in der Trickwiedergabemode ausgelesen werden, wobei der Synchronisationsblock mit der Nummer 0 der erste Trickwiedergabesynchronisationsblock ist, der von dem Kopf mit dem ersten Azimutwinkel ausgelesen wird.
• (c) für die Trickwiedergabegeschwindigkeiten +24-fach und –24-fach Nenngeschwindigkeit werden insgesamt 270 Trickwiedergabesynchronisationsblöcke während jeder Umdrehung der Kopftrommel ausgelesen, d. h. dreimal 90 Trickwiedergabesynchronisationsblöcke, da jedes Trickwiedergabesegment eine Anzahl von 90 Trickwiedergabesynchronisationsblöcken und zwei Wiederholungen jedes dieser 90 Trickwiedergabesynchronisationsblöcke enthält. Diese 90 Trickwiedergabesynchronisationsblöcke sind wieder von 0 bis einschließlich 89 nummeriert, in der Reihenfolge, in der sie während der genannten einen Umdrehung des Kopfes in der Trickwiedergabemode ausgelesen werden, wobei der Synchronisationsblock mit der Nummer 0 der erste Trickwiedergabesynchronisationsblock ist, der von dem Kopf mit dem ersten Azimutwinkel ausgelesen wird.

As a general rule, the following can be said:

• (a) For trick play speeds + 4 times nominal speed and 4 times nominal speed, a total of 100 trick play sync blocks are read in each revolution of the head drum, ie 90 sync blocks with information about the trick play signals concerned and 10 sync blocks with parity information. These 90 trick play sync blocks are numbered from 0 through 89 inclusive, in the order in which they are read out during one revolution of the head drum in the trick play mode, the trick play sync block 0 being the first trick play sync block read out by the head at the first azimuth angle. The 10 parity sync blocks numbered from 90 to 99, in the order in which they are read out during one revolution of the head drum, the trick play sync block 90 being the first trick play sync block with parity information read from the head at the first azimuth angle.
• (b) For trick play speeds + 12 times nominal speed and 12 times nominal speed, a total of 180 trick play sync blocks are read out during each revolution of the head drum, ie, 2 times 90 trick play sync blocks, since each trick play segment contains a number of 90 trick play sync blocks and one repeat of each of these 90 trick play sync blocks. These 90 trick play sync blocks are numbered again from 0 to 89, inclusive, in the order in which they are read out during said one revolution of the head in the trick play mode, where the sync block numbered 0 is the first trick play sync block from the head is read out with the first azimuth angle.
• (c) For the trick play speeds +24 times and 24 times nominal speed, a total of 270 trick play sync blocks are read out during each revolution of the head drum, ie, three times 90 trick play sync blocks, since each trick play segment contains a number of 90 trick play sync blocks and two repetitions of each of these 90 trick play sync blocks. These 90 trick play sync blocks are numbered again from 0 through 89, respectively, in the order in which they are read out during said one revolution of the head in the trick play mode, where the sync block numbered 0 is the first trick play sync block sent from the head to the head first azimuth angle is read out.

First, the trick play sync block numbering for the first trick play signal (+ 4 times play speed) will be described. During the time interval of a single revolution of the head drum, during playback at the + 4-times playback speed, the first head at the first azimuth angle will sense the trick play segment 22.5 (+4) off and the other head is feeling the trick play segment 22.6 (+4) from. The first 45 sync blocks in the segment 22.5 (+4) have a trick play sync block number from 0 to 44 inclusive. The first 45 sync blocks in the segment 22.6 (+4) have a trick play sync block number of 45 to 89 inclusive.

The five sync blocks in the segment 22.5 (+4) with the parity information following the 45 sync blocks numbered 0 through 44 have a trick play sync block number 90 through 94 inclusive and the five sync blocks in the segment 22.6 (+4) with the parity information following the 45 sync blocks numbered 45 through 89 inclusive, have a trick play sync block number 95 through 99 inclusive.

The trick play sync block numbering described above applies to all pairs of segments 22.i (+4) and 22.i + 1 (+4) where i is odd. The trick play sync block numbering is thus repetitive for each revolution of the head drum in the + 4-times play mode.

It It is therefore interesting to note that the trick play sync block numbering in a segment over the boundary between the sync blocks with the parity information and the other sync blocks in the segment is not continuous.

Thereafter, the trick play sync block numbering for the second trick play signal (-4 times the reproduction speed) will be described. In the time interval of a single rotation of the head drum, during playback at the -4x reproduction speed, the first head with the first azimuth angle scans the trick play segments 28.12 (-4) and 28.11 (-4) off and the other head is feeling the trick play segments 10.28 (-4) and 28.9 (-4) from. The first 23 sync blocks in the segment 28.12 (-4) have a trick play sync block number from 0 through 22 inclusive. The first 22 sync blocks in the segment 28.11 (-4) have a trick play sync block number of 23 through 44 inclusive.

The first 23 sync blocks in the segment 10.28 (-4) have a trick play sync block number from 45 to 67 inclusive. The first 22 sync blocks in the segment 28.9 (-4) Raise a trick play sync block number from 68 to 89 inclusive.

The two sync blocks in the segment 28.12 (-4) with the parity information following the 23 sync blocks numbered 0 through 22 inclusive, have a trick play sync block number 90 and 91. The three sync blocks in the segment 28.11 (-4) with the parity information following the 22 sync blocks numbered 23 through 44, respectively, have a trick play sync block number 92 through 94 inclusive. The two sync blocks in the segment 10.28 (-4) with the parity information following the 23 sync blocks numbered 45 through 67, respectively, have a trick play sync block number 95 and 96. The three sync blocks in the segment 28.9 (-4) with the parity information following the 22 sync blocks numbered 68 through 89 inclusive, have a trick play sync block number 97 through 99 inclusive.

The trick play sync block numbering described above applies to all groups of four segments 28.i (-4) . 28.i-1 (-4) . 28.i-2 (-4) and 28.i-3 (-4) where i is 4, 8, 12, 16, 20 and 24. The trick play sync block numbering is thus repetitive for each revolution of the head drum in the -4-times play mode.

It Again, it is interesting to note that the trick play sync block numbering in a segment over the boundary between the sync blocks with the parity information and the other sync blocks in the segment are not continuous is.

Of the Reason for choosing the order of occurrence of the trick play sync blocks and trick play sync block numbering +4 and +4 times Trick play mode in the manner explained above the following. This choice has the advantage of performing an ECC encoding become a possible recording feature on the trick play data can, or if the ECC encoding actually when recording performed on the trick play data, ECC correction can be any playback feature. The formal allows a other ECC coding, so that, for example, more or less trick play sync blocks for Storage of parity data required are. Since the parity sync blocks at the end each segment, and the numbering of parity sync blocks (90 and higher) the numbering of the 89 trick play sync blocks (0 to including 89) with the "real" information data follows, the numbering of these trick play sync blocks with "real" data still remains unchanged and can be processed in this way in the playback order, regardless of trick play sync blocks with parity data exist or not, or regardless of the number, how many Trick play sync blocks with parity data available.

Thereafter, the trick play sync block numbering for the third trick play signal (+12 times the reproduction speed) will be described. In the time interval of a single revolution of the head drum, during playback at the + 12-times playback speed, the first head with the first azimuth angle scans the trick play segments 34.i (+12) from where i runs from 5 to 8, and the other head is feeling the trick play segments 34.j (+12) with j running from 9 to 12. The first 12 sync blocks in the segment 34.5 (+12) have a trick play sync block number from 0 through 11. The first 11 sync blocks in the segment 34.6 (+12) have a trick play sync block number from 12 through 22 inclusive. The first 11 sync blocks in the segment 34.7 (+12) have a trick play sync block number from 23 through 33 inclusive. The first 11 sync blocks in the segment 34.8 (+12) have a trick play sync block number from 34 to 44 inclusive.

The first 12 sync blocks in the segment 34.9 (+12) have a trick play sync block number from 45 to 56 inclusive. The first 11 sync blocks in the segment 34.10 (+12) have a trick play sync block number from 57 to 67 inclusive. The first 11 sync blocks in the segment 34.11 (+12) have a trick play sync block number from 68 to 78 inclusive. The first 11 sync blocks in the segment 34.12 (+12) have a trick play sync block number of 79 to 89 inclusive.

The second 11 or 12 sync blocks, like a repeat the first 11 or 12 sync blocks in a segment, have the same trick play sync block number as the Synchronization blocks of which they are a repetition.

The trick play sync block numbering described above applies to all groups of eight segments 34.i (+12) where i runs from 5 to 8, inclusive, and i runs from 13, ... 16, 1, ... 4. The trick play sync block numbering from 0 to 89 is thus repetitive for each revolution of the head drum in the + 12-times play mode.

The trick play sync block numbering for the fourth trick play signal (-12 times the reproduction speed) will now be described. In the time interval of a single revolution of the head drum during playback at -12 times the playback speed, the first head at the first azimuth angle samples the trick play segments 40.i (-12) where i runs from 5 to 9, and the other head scans the trick play segments 40.j (-12) from where j runs from 1 to 4. The first 10 sync blocks in the segment 40.5 (-12) have a trick play sync block number that runs from 0 to 9 inclusive. The first 10 sync blocks in the segment 40.6 (-12) have a trick play sync block number from 10 through 19 inclusive. The first 10 sync blocks in the segment 40.7 (-12) have a trick play sync block number from 20 through 29 inclusive. The first 10 sync blocks in the segment 40.8 (-12) pick up a trick play sync block number from 30 through 39 inclusive. The first 10 sync blocks in the segment 40.9 (-12) have a trick play sync block number from 40 to 49 inclusive. The first 10 sync blocks in the segment 40.1 (-12) have a trick play sync block number from 50 to 59 inclusive. The first 10 sync blocks in the segment 40.2 (-12) have a trick play sync block number from 60 to 69 inclusive. The first 10 sync blocks in the segment 40.3 (-12) have a trick play sync block number from 70 to 79 inclusive. The first 10 sync blocks in the segment 40.4 (-12) have a trick play sync block number from 80 to 89 inclusive.

The second 10 sync blocks in the trick play segments, the repetitions of the first 10 synchronization blocks in a segment have the same trick play sync block number like the sync blocks, of which they are a repetition.

The trick play sync block numbering described above applies to all groups of nine segments 40.i (-12) until finally 40.i + 8 (-12) where i is equal to 1 and 10. The trick play sync block numbering from 0 to 89 is thus repeating for each revolution of the head drum in the -12 times play mode.

Hereinafter, the trick play sync block numbering for the fifth trick play signal (+24 times the reproduction speed) will be described. During the time interval of a single revolution of the head drum, during playback at the +24 times playback speed, the first head at the first azimuth angle will scan the trick play segments 48.i (+24) with i running from 1 to 9, and the other head scans the trick play segments 48.j (+24) with j running from 10 to 18. The first five sync blocks in the segment 48.1 (+24) have a trick play sync block number from 0 through 4. The first five sync blocks in the segment 48.2 (+24) have a trick play sync block number from 5 to 9 inclusive. The first five sync ons blocks in the segment 48.3 (+24) have a trick play sync block number from 10 to 14 inclusive. The first five sync blocks in the segment 48.4 (+24) raise a trick play sync block number from 15 through 19 inclusive. The first five sync blocks in the segment 48.5 (+24) have a trick play sync block number of 20 through 24. The first five sync blocks in the segment 48.6 (+24) have a trick play sync block number from 25 through 29 inclusive. The first five sync blocks in the segment 48.7 (+24) have a trick play sync block number from 30 through 34 inclusive. The first five sync blocks in the segment 48.8 (+24) have a trick play sync block number from 35 to 39 inclusive. The first five sync blocks in the segment 48.9 (+24) have a trick play sync block number from 40 to 44 inclusive. The first five sync blocks in the segment 48.10 (+24) have a trick play sync block number from 45 to 49 inclusive. The first five sync blocks in the segment 48.11 (+24) have a trick play sync block number of 50 through 54 inclusive. The first five sync blocks in the segment 48.12 (+24) have a trick play sync block number from 55 to 59 inclusive. The first five sync blocks in the segment 48.13 (+24) have a trick play sync block number from 60 to 64 inclusive. The first five sync blocks in the segment 48.14 (+24) have a trick play sync block number from 65 to 69 inclusive. The first five sync blocks in the segment 48.15 (+24) have a trick play sync block number from 70 through 74 inclusive. The first five sync blocks in the segment 48.16 (+24) have a trick play sync block number from 75 to 79 inclusive. The first five sync blocks in the segment 48.17 (+24) have a trick play sync block number from 80 to 84 inclusive. The first five sync blocks in the segment 48.18 (+24) have a trick play sync block number of 85 through 89 inclusive.

The second group of 5 sync blocks and the third group of 5 sync blocks in the segments are repetitions of the first group of 5 sync blocks in a segment. These sync blocks have the same trick play sync block numbers like the sync blocks in the first group, of which they are a repeat.

The trick play sync block numbering described above applies to all groups of 18 segments 48.i (+24) in a group of 48 tracks, where i runs from 1 to 18. The trick play sync block numbering from 0 to 89 is thus repetitive for each revolution of the head drum in the + 24-times play mode.

Hereinafter, the trick play sync block numbering for the sixth trick play signal (-24 times the reproduction speed) will be described in detail. In the time interval of a single revolution of the head drum, during playback at the -24 times playback speed, the first head at the first azimuth angle will sense the trick play segments 54.i (-24) with i running from 9 to 18, and the other head scans the trick play segments 54.j (-24) with j running from 1 to 8. The first five sync blocks in the segment 54.9 (-24) have a trick play sync block number from 0 through 4. The first five sync blocks in the segment 54.10 (-24) have a trick play sync block number from 5 through 9 inclusive. The first 5 sync blocks in the segment 54.11 (-24) have a trick play sync block number from 10 to 14 inclusive. The first five sync blocks in the segment 54.12 (-24) have a trick play sync block number of 15 through 19. The first five sync blocks in the segment 54.13 (-24) have a trick play sync block number of 30 through 24. The first five sync blocks in the segment 54.14 (-24) have a trick play sync block number of 25 through 29 inclusive. The first five sync blocks in the segment 54.15 (-24) have a trick play sync block number from 30 through 34 inclusive. The first five sync blocks in the segment 54.16 (-24) have a trick play sync block number from 35 to 39 inclusive. The first five sync blocks in the segment 54.17 (-24) have a trick play sync block number from 40 to 44 inclusive. The first five sync blocks in the segment 54.18 (-24) have a trick play sync block number from 45 to 49 inclusive. The first five sync blocks in the segment 54.1 (-24) have a trick play sync block number of 50 through 54 inclusive. The first five sync blocks in the segment 54.2 (-24) have a trick play sync block number from 55 to 59 inclusive. The first five sync blocks in the segment 54.3 (-24) have a trick play sync block number from 60 to 64 inclusive. The first five sync blocks in the segment 54.4 (-24) have a trick play sync block number from 65 to 69 inclusive. The first five sync blocks in the segment 54.5 (-24) have a trick play sync block number from 70 to 74 inclusive. The first five sync blocks in the segment 54.6 (-24) have a trick play sync block number from 75 to 79 inclusive. The first five sync blocks in the segment 54.7 (-24) have a trick play sync block number from 80 to 84 inclusive. The first five sync blocks in the segment 54.8 (-24) have a trick play sync block number of 85 through 89 inclusive.

The second and third group of five sync blocks are repetitions of the first group of five sync blocks in a segment. The sync blocks in this second and third Group have the same trick play sync block numbers like the sync blocks in the first group, of which they are a repeat.

The trick play sync block numbering described above applies to all groups of 18 segments 54.i (-24) in a group of 48 tracks, where i runs from 1 to 18. The trick play sync block numbering from 0 to 89 is thus repetitive for each revolution of the head drum in the -24 times play mode.

The Trick play sync block numbers 0 to 99 require one 7-bit count word, which is called TPSB #. While a scan of the record carrier by one of the read heads in the trick play mode A maximum of 55 trick play sync blocks are read out. So if the head is taken into account which is in reproduction contact with the record carrier, could one is a 6-bit count word Use RSB # as the sync block number of the trick play sync blocks and thereby storing the trick play sync blocks the record carrier save a bit.

• 1.1 RSB# entspricht den 6 am wenigsten signifikanten Bits von TPSB#, wenn die Trickwiedergabesynchronisationsblocknummer kleiner als 50 ist und der entsprechende Trickwiedergabesynchronisationsblock von dem ersten Kopf mit dem ersten Azimutwinkel geschrieben wird.
• 1.2 Sonst, RSB# entspricht den 6 am wenigsten signifikanten Bits von (TPSB#-40).

The 7-bit trick play sync block numbers TPSB # can be converted to the 6-bit numbers RSB # as follows:

• 1.1 RSB # corresponds to the 6 least significant bits of TPSB # when the trick play sync block number is less than 50 and the corresponding trick play sync block is written from the first head at the first azimuth angle.
• 1.2 Otherwise, RSB # corresponds to the 6 least significant bits of (TPSB # -40).

• 2.1 Die 6 am wenigsten signifikanten Bits von TPSB# entsprechen RSB#, wenn die RSB# kleiner ist als 50 und der entsprechende Trickwiedergabesynchronisationsblock von dem ersten Kopf mit dem ersten Azimutwinkel ausgelesen wird. Das 7. Bit von TPSB# wird dann als "0" genommen.
• 2.2 Sonst, TPSB# = RSB#+40.

Reversion to the trick play sync block number when playing back in a trick play mode is accomplished in the following manner:

• 2.1 The 6 least significant bits of TPSB # correspond to RSB # when the RSB # is less than 50 and the corresponding trick play sync block is read from the first head at the first azimuth angle. The 7th bit of TPSB # is then taken as "0".
• 2.2 Otherwise, TPSB # = RSB # + 40.

below follows a panel with the trick play sync block numbers TPSB # for the + 4-fold trick play mode, where the head with the first Azimuth angle the trick play sync blocks with the number 0 to inclusive 49 and 90 up to and including 94 during read out a single scan and the head with the second azimuth angle trick play sync blocks numbered 45 to 89 inclusive reads.

at the conversion, as explained above, the RSB # are as follows:

As can be seen from the second panel, the ge in the formula under the above 1.2 value "40" should not be a higher value, because in such cases the RSB # for the trick play parity sync blocks would become less than 50, and thus trick play sync blocks read from the head with the first azimuth angle would have the same sync block numbers, which is unacceptable. Further, the value to be subtracted from TPSB # can not be less than 36, since in this case the RSB # would run for the trick play sync blocks from 59 to 63 read from the second azimuth angle head. 63 is the highest number that can be represented by the 6-bit RSB word.

The format of the trick play sync blocks will now be described with reference to FIG 8th described in more detail. A trick play sync block has the same length as the other sync blocks in the main data area 12 in FIG 1 in which the first digital information signal is stored. A trick play sync block is 112 bytes long and includes a sync word of 2 bytes long, an identification part 60, designated as ID, a header 61, referred to as a "main header", an auxiliary byte 62, referred to as "data-aux", and a data area 64 Is 104 bytes long. The data area 64 has space for storing 96 bytes of trick play signal data (one of the second through seventh information signals) and 8 parity bytes.

9 2 shows the two bytes 70 and 71 of the main head area 61 8th , Only six bits, that is, the bits b ₀ to b _{5 of} the byte 72 of the main head area 61 are available for storing a trick play sync block number TPSB #, although the TPSB # is expressed as a 7-bit number. The 6-bit number that can be stored in the six bits b ₀ to b _{5 of} the byte 72 is designated as RSB #.

Furthermore, a trick play speed identifier is stored in the trick play sync blocks. The trick play speed identifier identifies the trick play speeds 4 ×, 12 × and 24 ×. A 2-bit word is sufficient for such identification. This 2-bit trick play rate identifier word is written in the two remaining bits b ₆ and b ₇ of byte 72 in FIG 9 saved. In addition, in the trick play sync blocks, a direction identifier is to be stored to identify a trick play block for a trick play speed identified by the 2-bit trick play speed identifier as the trick play sync block for said speed in the forward or backward direction. The byte 70, see 9 in the main head area 61 , please refer 8th , can be used to store the direction identifier. More specifically, the 2-bit word b ₃ , b ₂ includes the direction identifier, so that the 2-bit word "10" means that the trick play synchronization block means for a trick play speed in the forward direction, while the 2-bit word "11" means that is, the trick play synchronization block is meant for a trick play speed in the reverse direction. It should also be noted that the bits b ₃ , b ₂ = "00" in byte 70 means that the sync block is a sync block with "normal play" data.

Normal playback sync blocks and trick play sync blocks may contain dummy data. This means that the data area 64 of such sync blocks contain useless information for the trick play rate for which the trick play sync block is meant. The 2-bit word b ₃ , b _{2 of} the byte 70, when equal to "01", means that the synchronization block concerned contains dummy data. Consequently, for such a dummy data synchronization block, it is not possible to store the direction identifier at the same location in the byte 70. In this situation, the two bits b ₀ and b ₁ of byte 70 are used. In particular, when the bits b ₃ , b _{2 are} equal to "01" (dummy data), the bits b ₀ , b _{1 have} the following meaning: b ₁ , b ₀ = "00" means dummy data for "normal reproduction".

b ₁ , b ₀ = "01" means dummy data for trick play in the forward direction. b ₁ , b ₀ = "10" means dummy data for trick play in the reverse direction.

It will be appreciated that other 2-bit words could have been used as an alternative. For example, b ₁ , b ₀ = "10" could have meant dummy data for trick play in the forward direction and "01" could have meant: dummy data for trick play in the reverse direction.

Another feature to be described is the timing of the trick play sync blocks. Time stamping is well known in the art. It is pointed out in this regard US 5,579,183 , Document D1 in the reference material, and international application WO 96 / 30.905, document D2 in the reference material. The documents describe the recording of MPEG packets on a record carrier, wherein on arrival time stamps are added to an MPEG packet and the packet is subsequently recorded. During playback, the packet is read from the record carrier, the time stamp is retrieved from the packet and used to deliver the packet to an output at the correct time.

10 shows how an MPEG transport packet, which is 188 bytes long, is stored in two consecutive sync blocks, especially in the data area 64a two consecutive sync blocks. First, a packet header 75 which is 4 bytes long in the data area 64a of the first block of the two sync blocks, referred to as SB _n . Thereafter, 92 bytes of the MPEG packet become in the remaining part of the data area 64a of the synchronization block SB _n stored. The remaining 96 bytes of the MPEG packet are in the data area 64a of the second synchronization block SB _{n + 1} stored. The timestamp corresponding to a transport packet will be in the packet header 75 saved. This is in 11 shown. More specifically, the time stamp for "normal play" data is 22 bits long and is in the last 22 bits of the packet header 75 saved.

The 22-bit time stamp for the "normal playback" data is in one TSL part ("time stamp low ") and a TSH part ("time stamp high "). The TSL part is 18 bits long and running cyclic with a modulo value of 225,000 um, for a device in which the head drum with Turns 1800 revolutions per minute, or with a modulo value from 225,225 for a machine, in which the head drum turns with 1800/1001 revolutions per minute turns. The TSH part is 4 bits long and runs cyclically with a modulo value from 12 um. At every return to 0 for TSL increases the TSH value by one.

One Time stamp counter is available in the recorder to be described later. To produce of time marks for the MPEG packages for a "normal playback" information signal has the timestamp counter a period equal to six turns of the head drum. The timestamp counter generates in the present example, the 22-bit time stamps in the form of counter words with a clock frequency of 27 MHz.

Trick play information for one certain trick play speed may be from an MPEG data stream obtained by recovering packets with I-frames, which in itself well known in the art, from the MPEG data stream, and that these packets are stored in the trick play sync blocks become.

One Time stamp counter the same counter as mentioned above is to generate timestamps for the MPEG packets for a Trick play information signal available. This timestamp counter has a period equal to a single revolution of the head drum. Of the Timestamp counter generated in the present example 20-bit counter words with a clock frequency of 27 MHz. The time stamp for the trick play data again consists of an 18-bit TSL part, according to the above-described TSL part for the normal reproduction time markers, and a TSH 'part. TSL is running cyclic with a modulo value of 225,000 for a device in which the head drum with Turns 1800 revolutions per minute, or with a modulo value from 225,225 for a machine, in which the head drum with 1800 / 1.001 revolutions per minute turns. The TSH 'part is 2 bits long and runs cyclically with a modulo value of 4. On every return to 0 for TSL becomes the TSH value around One increased. Thus, the period of TSL corresponds to a quarter of a turn the head drum and the trick play time mark counter is with one turn of the head drum periodically. The timestamp counter is across from the head switching pulse normally present in the device is synchronized.

The 20-bit timestamp is in the packet header 75 of the first of two consecutive trick play synchronization views in which the MPEG packet corresponding to that time mark is stored, see 12 ,

One Transport packet for storage in two consecutive trick play sync blocks in this way a timestamp and the two consecutive Trick play sync blocks, in which the transport package each have a corresponding trick play sync block number, which refers to the position in the tracks in which these Trick play sync blocks are recorded.

From the time stamp added to the transport packet, a nominal trick play sync block number for the two trick play sync blocks in which the carry packet is stored can be derived using the following equation: NTPSB # = int [(k + n / N) × 90/4], wherein NTPSB # is the nominal trick play sync block number, where N is a constant corresponding to 225,000, in a recorder in which the rotary head drum rotates at 1800 rpm, and 225,225 corresponds to a recorder in which the rotary head drum is rotating with 1800/1001 revolutions per minute, where n equals the decimal value of TSL and where k is the decimal value of TSH '.

thereupon the two consecutive trick play sync blocks are determined at Places recorded in one or two tracks on the record carrier. These digits correspond to the actual trick play sync block numbers, designated by ATPSB # stored in these trick play sync blocks.

The relationship between the actual trick play sync block number ATPSB # of a trick play sync block and the nominal trick play sync block number NTPSB # derived for this block is now as follows: NTPSB # - 45 <ATPSB # <NTPSB # + 45.

On this way is ensured that spot where a trick play sync block with a part of a trick play package in the tracks on the record carrier during a Rotation of the head drum is recorded, not too far from the Place is removed where this block would have recorded optimally should be, so that the buffer memory for storing at Playback from the record carrier read packets not too big too needs to be. The above formula clearly shows that a Trick play sync block with part of a trick play package recorded in the same track as the nominal position or in a track earlier or later. But even if in a previous one or a later one Track recorded, will be ensured that the trick play sync block during playback, in the time is pushed back to the right place.

The above given formula applies to all trick play information signals recorded on the record carrier but it should be noted that if ATPSB # is chosen to be less than 0 then this means that the trick play sync block with the trick play sync block number ATPSB # + 90 during the previous rotation of the head drum is recorded while if ATPSB # greater than 89 selected This means that the trick play sync block with the trick play sync block number ATPSB # -90 during the subsequent rotation of the head drum is recorded.

Hereinafter, an apparatus of the helical-scan recording method for recording the trick-play information on an elongated recording medium will be described. 13 shows the recorder that has an input terminal 111 for receiving a video signal and a corresponding audio signal. The video signal and the corresponding audio signal may be encoded in transport packets included in an MPEG serial data stream, which is well known in the art. The input terminal 111 is with an entrance 112 a "normal rendering" processing unit 114 coupled. Furthermore, a "trick play" processing unit 116 provided with an entrance 117 also with the input terminal 111 is coupled. The exits 119 and 120 the "normal playback" processing unit 114 or the "trick play" processing unit 116 are with corresponding inputs of a multiplexer 122 coupled. The "normal reproduction" information as well as the "trick play" information become in the main area recording part 12 the in 2 recorded track recorded.

For a further description of the "normal rendering" processing unit 114 and the "trick play" processing unit 116 Reference is made to EP-A 702,877, document D1 in the reference.

It is a subcode and auxiliary signal generator 124 provided for supplying the subcode signal information for storage in the subcode signal recording part 4 and for providing the auxiliary signal for storage in the auxiliary signal recording part 8th , please refer 2 , Outputs of the multiplexer 122 and the generator 124 are connected to corresponding inputs of an error correction coding unit 126 coupled. The error correction coding unit 126 is capable of performing an error correction coding step on the "normal reproduction" (video and audio) information and the trick play information so that those in the part 12b of the main signal recording part 12 in 2 and in the parts 64b the synchronization blocks represented Pa information, see 8th and 10 ,

The recording device further comprises a generator 130 for adding the sync and ID information for the sync blocks, as in 8th shown. After combining the signals in the combination unit 132 becomes the combined signal of a unit 234 supplied, in which a channel coding is performed on the composite signal. The in the coding unit 134 Channel coding performed is well known in the art. For an example of such channel coding, reference is made in this regard to US-A 5,142,421, document D3 in the reference.

An output of the channel coding unit 134 is with an input of a writing unit 136 coupled, wherein the with the coding unit 134 obtained data stream in the oblique tracks on the record carrier 140 is stored, with the help of at least two write heads 142 and 144 resting on a spinning head drum 146 are located. The writing heads 142 and 144 have head gaps with a mutually different azimuth angle, so that (for example) the head 142 the tracks with an azimuth angle from bottom left to top right in 1 writes and the head 144 the tracks with an azimuth angle from top left to bottom right in 1 writes. Furthermore, a timestamp generator 147 available for generating timestamps for the normal playback processing unit 114 and the trick play processing unit 116 ,

• – die Steuerung des Normalwiedergabe-Signalverarbeitungsblocks 114 über die Steuerver bindung 150,
• – die Steuerung des Trickwiedergabesignalverarbeitungsblocks 116 über die Steuerverbindung 152,
• – die Steuerung des Subcodesignal- und Hilfssignalgeneratorblocks 124 über die Steuerverbindung 154,
• – die Steuerung des Fehlerkorrekturcodierungsblocks 126 über die Steuerverbindung 156,
• – die Steuerung des Synchronisationssignal- und ID-Signalgenerators 130 über die Steuerverbindung 158,
• – die Steuerung des Kanalcodierungsblocks 134 über die Steuerverbindung 160,
• – die Steuerung der Transportgeschwindigkeit des Aufzeichnungsträgers 140 und der Drehung der Kopftrommel 146 über die Steuerverbindung 162, und
• – die Steuerung des Zeitmarkierungsgenerators 147 über die Steuerverbindung 164.

There is a microprocessor unit 148 for controlling the function of the respective blocks, such as:

• The control of the normal playback signal processing block 114 over the Steuerver connection 150 .
• The control of the trick play back signal processing block 116 over the control connection 152 .
• The control of the subcode signal and auxiliary signal generator block 124 over the control connection 154 .
• The control of the error correction coding block 126 over the control connection 156 .
• The control of the synchronization signal and ID signal generator 130 over the control connection 158 .
• The control of the channel coding block 134 over the control connection 160 .
• - The control of the transport speed of the recording medium 140 and the rotation of the head drum 146 over the control connection 162 , and
• The control of the timing generator 147 over the control connection 164 ,

The trick play processing 116 is provided for recovering I-frame information from the first information signal, in a manner well known in the art. In the processing unit 116 At the trick play information, an additional error correction coding step is performed to generate the 10 trick play sync blocks with the parity information for the + 4-fold and 4-times trick play speed. Furthermore, repetitions of trick play sync blocks are generated for the + 12-fold, -12-fold, + 24-fold, and -24-fold trick play information signals.

Farther be for each trick play information signal generates trick play sync blocks, in the sense that for each trick play sync block of the trick play speed identifier and the direction identifier is generated and in the trick play sync block It will also be saved at the location described above a trick play sync block number ATPSB # on top described manner and in the trick play sync block stored, and to each packet in the respective trick play information signals a time stamp is added.

Thereafter, the trick play sync blocks and the "normal play" sync blocks produced by the normal reproduction signal processing unit 114 are generated in the multiplexer unit 122 so that to record information in a complete track of one of the heads, the sequence of normal play information sync blocks and the trick play information is such that the main data area 12 one of the 48 tracks out 1 can be created.

Subcode data and auxiliary data are added, and on the combined normal reproduction data and trick play data, error correction coding is performed to obtain the parity information for the track part 12b , Furthermore, synchronization words and identification information are added. Thereafter, before recording the information in the tracks on the information, a channel coding step is performed.

It should be noted that when recording groups of 48 consecutive tracks, two spu in each group, ie the first and the last represented in 1 , have no trick play segments at all. This provides the possibility to realize editing, whereby the edit points can be chosen exactly at the location of the two tracks that have no trick play segments stored therein.

An embodiment of the timestamp generator unit 147 will be described below. In the prior art it is known, see WO 96 / 30.905-A2, document D2, the timestamp generator unit 147 with an oscillator locked to the program clock reference (PCR) included in the MPEG packets, this oscillator providing counts to a counter at a 27 MHz frequency.

14 shows an embodiment of the timestamp generator 147 that with a 127 MHz oscillator 172 is provided, which is a counter 174 27 MHz clock pulses supplies. In response, the counter generates 174 "Normal Playback" time marks at a rate of 27 MHz at one output 170 for feeding to the normal reproduction processing unit 114 , The 27 MHz clock pulses also become a frequency divider 176 fed, which divides the clock frequency by 4. The value 4 refers to the ratio of the first trick play speed (4 times) to the rated speed (1 times). The clock pulses divided by 4 in frequency become a counter 178 , an inverse counter 180 and another frequency divider 182 fed. The counter 178 provides the trick play time markers (TP1) for the first trick play information signal, which is the trick play signal for a playback speed equal to + 4 times the rated speed, and supplies the TP1 time markers via the output 172a to the trick play processing unit 116 , The reverse counter 180 provides the trick play time markers (TP2) for the second trick play information signal, which is the trick play signal for a playback speed equal to -4 times the rated speed, and provides the TP2 time markers over the output 172b to the trick play processing unit 116 ,

The reason for frequency division by a factor of 4 in the frequency divider 176 is the following. It is assumed that the NP timestamps from the counter 174 for time stamping the packets for the first trick play signal. When playing at a speed equal to 4 times the rated speed, these packages would arrive at a 4 times higher speed. By dividing the frequency of the generation of the time marks by four, as in the frequency divider 176 and using these time stamps for time stamping the packets of the first trick play signal, the proper timing for the packets of the trick play signal can be recovered when playing back in the trick play mode. Furthermore, in order to obtain the proper timing when reproducing the -4-fold trick play signal, it is necessary to reverse the generation order of the time marks as a function of time. This is realized by counting the counts in the reverse counter 180 be reversed.

The frequency of the frequency divider 176 the frequency divider 182 supplied clock pulses is now in the frequency divider 182 divided by 3. The value 3 refers to the ratio of the second trick play speed (12 times) to the first trick play speed (4 times). The clock pulses divided by 3 in frequency become a counter 184 , an inverse counter 186 and another frequency divider 188 fed. The counter 184 supplies the trick play time markers (TP3) for the third trick play information signal, which the trick play signal for the playback speed is equal to + 12 times the rated speed, and supplies the TP3 time marks through the output 172c to the trick play processing unit 116 , The backward counter 186 provides the trick play time markers (TP4) for the fourth trick play information signal, which is the trick play signal for a playback speed equal to -12 times the rated speed and provides the TP4 time markers over the output 172d to the trick play processing unit 116 ,

The frequency of the frequency components 182 the frequency divider 188 delivered clock pulses are now in the frequency divider 188 halved. The value 2 refers to the ratio of the third trick play speed (24 times) to the second trick play speed (12 times). The frequency halved clock pulses become a counter 190 and a backward counter 192 fed. The counter 190 provides the trick play time markers (TP5) for the fifth trick play information signal, which is the trick play signal for a playback speed equal to +24 times the rated speed, and provides the TP5 time markers over the output 172e to the trick play processing unit 116 , The backward counter 192 provides the trick play time markers (TP6) for the sixth trick play information signal, which is the trick play signal for a playback speed equal to -24 times the rated speed, and supplies the TP6 time markers via the output 172f to the trick play processing unit 116 ,

15 schematically shows an embodiment of a reproducing apparatus for reproducing information from the recording medium 140 , obtained with the recorder after 13 , The playback device comprises a reading unit 250 with at least two reading heads 252 and 254 for reading out information from the oblique tracks on the record carrier 140 , The one head has a gap with an azimuth angle, the azimuth angle of the write head 142 corresponds and the other head has a gap with an azimuth angle, the azimuth angle of the write head 144 equivalent. An output of the reading unit 250 is connected to an input of a channel decoder unit 254 coupled. The channel decoder unit may be adapted to perform 25-to-24 decoding on the read-out signal to convert 25-bit words in the incoming data stream into 24-bit words, as explained in document D3. After that, in the error correction unit 258 performed an error correction.

The error correction unit 258 is used to perform error correction on the information read from the record carrier in the "normal reproduction" mode based on the parts 12b the traces of parity information read, see 2 , and in the parts 64b the synchronization blocks stored parity information, see 8th , In a trick play mode, only an error correction will (can) be based on the parts in the parts 64b the trick play sync blocks stored parity information (be).

The output of the error correction unit 258 is with an entrance 259 a "normal rendering" processing unit 260 Furthermore, a "trick play processing unit 262 provided an entrance 261 which also coincides with the output of the error correcting unit 258 is coupled. The exits 264 and 265 the "normal playback" processing unit 260 and the "trick play" processing unit 262 are with appropriate terminals a and b of a switch 266 coupled, with a c-terminal with an output terminal 268 is coupled.

When the playback device is switched to a "normal playback" mode, it means that the record carrier 140 is transported at a rated speed that the "normal playback" unit 260 is released and that the switch 266 is switched to position a-c. When the playback device is switched to a "trick play" mode, also referred to as "feature mode", it means that the record carrier 140 is transported at a speed that is different than the rated speed that the "trick play" processing unit 262 is released and that the switch 266 is switched to the position b-c.

To enable a "trick play" mode, the player continues to use tape servo controls 270 which generate a control signal for controlling the speed of the recording medium 140 , In particular, the control means generate 270 a control signal during the "trick play" mode for transporting the record carrier 140 such that in the first trick play mode, wherein the speed of the record carrier is + 4 times the nominal reproduction speed, after 1 , the head 252 the tracks according to the lines 24.1 and 24.2 exactly crosses and the head 254 the tracks according to the lines 26.1 and 26.2 in 1 exactly crosses.

In the second trick play mode, where the speed of the record carrier is -4 times the nominal playback speed, the control means generates 270 a control signal, so that after 3 the head 252 the tracks according to the lines 30.1 and 30.2 exactly crosses and the head 254 the tracks according to the lines 32.1 and 32.2 in 3 exactly crosses.

In the third trick play mode, where the speed of the record carrier is +12 times the nominal playback speed, the control means generates 270 a control signal, so that after 4 the head 252 the tracks according to the lines 37.1 and 37.2 exactly crosses and the head 254 the tracks according to the lines 36.1 and 36.2 in 4 exactly crosses.

In the fourth trick play mode, where the speed of the record carrier is -12 times the nominal playback speed, the control means generates 270 a control signal, so that after 5 the head 252 the tracks according to the line 42 exactly crosses and the head 254 the tracks according to the line 44 in 5 exactly crosses.

In the fifth trick play mode, where the speed of the record carrier is +24 times the nominal playback speed, the control means generates 270 a control signal, so that after 6 the head 252 the tracks according to the line 50 exactly crosses and the head 254 the tracks according to the line 51 in 6 exactly crosses.

In the sixth trick play mode, where the speed of the record carrier is -24 times the nominal playback speed, the control means generates 270 a control signal, so that after 7 the head 252 the tracks according to the line 56 exactly crosses and the head 254 the tracks according to the line 58 in 7 exactly crosses.

The transport control of the record carrier realized in the manner described above is referred to as: track select transport control, in the sense that certain tracks are selected over the record carrier for playback in a trick play mode, said tracks starting at certain tracks on the record carrier. Furthermore, the paths are chosen so that at least one of the two read heads is capable of being in the recording parts 4 read the tracks recorded subcode information. In 1 This is the head of the tracks 24.1 and 24.2 follows. The head of the tracks 26.1 and 26.2 is unable to get the subcode recording parts 4 because it touches the subcode recording parts of the tracks with the wrong azimuth. In 3 This is the head of the tracks 30.1 and 30.2 follows. The head, the routes 32.1 and 32.2 is unable to get the subcode recording parts 4 as it scans the subcode recording portions of tracks having the wrong azimuth angle. In 4 This is the head of the tracks 37.1 and 37.2 follows. The head of the tracks 36.1 and 36.2 is unable to get the subcode recording parts 4 as it scans the subcode record portions of tracks at the wrong azimuth angle. In 5 this is the head of the track 42 follows. The head of the track 44 is unable to get the subcode recording parts 4 as it scans the subcode record portions of tracks at the wrong azimuth angle. In 6 that's the head of the track 50 follows. The head of the track 51 is unable to get the subcode recording parts 4 as it scans the subcode record portions of tracks at the wrong azimuth angle. In 7 that's the head of the track 58 follows. The head of the track 56 is unable to get the subcode recording parts 4 as it scans the subcode record portions of tracks at the shallow azimuth angle.

Playback in a trick play mode will now be described in detail. During trick play, bursts of information about "normal play" data and bursts of information about "trick play" data are read out from the two heads during one revolution of the head drum. Not Complete "Normal Playback" Data is ignored and so far "normal play" sync blocks are read out, these sync blocks are identified by their identifiers (bits b ₃ , b ₂ in byte 70 equals "00", see 9 ) as "normal playback" data and are consequently ignored.

Once a sync block is read which has a trick play identifier which is stored in the two remaining bits b ₇ , b ₆ of byte 72 in FIG 9 Further, the direction identifier identifies a trick play speed in the forward direction (bits b ₃ , b _{2 of} the byte 72 in FIG 9 is equal to "10"), the readout sync block is detected as a trick play sync block for the + 12-times nominal reproduction mode and in the trick playback processing unit 262 saved for further processing.

For the + 4-times playback speed as well as the -4-times playback speed, the parity data read from the record carrier during a single revolution of the head drum is used to perform ECC on the trick play data retrieved from the record carrier during the same turn of the head drum , For the other trick play speeds, the repetitions of the trick play sync blocks are used to perform error correction on the reproduced data. The trick play sync block numbers for each of the trick play sync blocks can be derived from the RSB # stored in the 6 bits b ₀ to b _{5 of} the byte 72, in the manner explained above, using the knowledge of which head is associated with the Record carrier is in playback contact. When the trick play sync block numbers are derived, these numbers are used to store the trick play sync blocks at specific memory locations in a processing memory located in the processing unit 262 located.

It should be noted at this point that the use of trick play sync block numbers is preferred over the use of sync block numbers to store the trick play sync blocks in the processing memory. The trick play sync block numbers refer directly to the memory locations in said processing memory in which the trick play sync blocks are to be stored. Using the sync block numbers instead would require a conversion table to convert the sync into the corresponding trick play sync block numbers for storing the trick play sync blocks at their proper locations in the processing memory. This conversion table should therefore be stored in the playback device. However, such a conversion table would avoid that the recording / playback system described is "forward compatible", in the sense that if a different match between sync block numbers and trick play sync block numbers were selected in a new version of the record / playback system, the older system and would render the tapes obtained with the older system useless in the new system.

Farther is done by using the trick play sync block numbers record the trick play sync blocks the record carrier more flexible because a trick play sync block with a specific trick play sync block number on one variable location stored in a track on the record carrier can be. By varying this location, the sync block number becomes change. The trick play sync block number will not change, so that during playback regardless of where the trick play sync block has been stored in the track, this in place is stored in the processing memory. Besides that is for storing the conversion table and for carrying out the Conversion no memory space required.

The trick play packages can now be retrieved from two consecutive trick play sync blocks. The timestamps for each packet of the trick play information signal are from the packet header 75 derived, see 10 ,

In the processing unit 262 For example, the timestamps derived from each of the packets are compared to a reference timestamp generated by a reference timestamp counter stored in the processing unit 262 with a 27 MHz frequency. If the value of the timestamp of a packet matches the value of the timestamp generated by the reference timestamp counter, the packet will be at the output 265 for obtaining a valid MPEG transport stream at the output terminal 268 , An MPEG decoder may be provided in the device, coupled with the clamp 286 , or it can be a single decoder.

While the present invention described in terms of preferred embodiments thereof is likely it is clear that these are not limiting examples. consequently likely the expert in the context of the present invention, as by the claims defined, come in several modifications. The first information signal could consequently be of a different type than a digital video signal and / or an audio signal, such as a data signal. Furthermore, that could trick play signal recorded in the trick play segments be an information signal that has no relation whatsoever the first digital information signal. In such a embodiment is the record carrier a recording medium on which a plurality of transmission channels for transmission independent Information signals available are.

Farther For example, the present invention resides in every new feature or in each Combination of features.

• 1. Es wird eine feste Anzahl Trickwiedergabesynchronisationsblöcke während einer einzigen Umdrehung der Kopftrommel in einer Trickwiedergabemode aus dem Aufzeichnungsträger ausgelesen: in dem vorliegenden Beispiel, 90 Trickwiedergabesynchronisationsblöcke.
• 2. Das erhaltene Format ermöglicht das Auslesen des Subcodes in einer Trickwiedergabemode.
• 3. Es gibt möglicht viele Datenbursts verteilt über die zwei Abtastungen der beiden Köpfe in einer einzigen Umdrehung der Kopftrommel.
• 4. Die Trickwiedergabesegmente sind möglichst kurz zum Erhalten einer robusten Trickwiedergabe.
• 5. Das Format ist in Gruppen von (p =) 48 Spuren wiederholend und ist derart gewählt, dass Editing verwirklicht werden kann, und zwar aus dem Grund, dass wenigstens eine der Spuren in der Gruppe von 48 Spuren keine Trickwiedergabeinformation hat.
• 6. Eine optimale Position der Segmente gegenüber der idealen Abtastlinie eines Wiedergabekopfes kann erhalten werden.
• 7. Es wird eine optimale Robustheit gegenüber Spurfolgefehlern und fehlenden Trickwiedergabesynchronisationsblöcken erhalten.

The advantages of the recording / reproducing system described above can be summarized as follows:

• 1. A fixed number of trick play sync blocks are read from the record carrier during a single revolution of the head drum in a trick play mode: in the present example, 90 trick play sync blocks.
• 2. The obtained format allows the reading of the subcode in a trick play mode.
• 3. There are as many data bursts as possible distributed over the two samples of the two heads in a single revolution of the head drum.
• 4. The trick play segments are as short as possible to obtain a sturdy trick play.
• 5. The format is repetitive in groups of (p =) 48 tracks and is selected so that editing can be realized for the reason that at least one of the tracks in the group of 48 tracks has no trick play information.
• 6. An optimal position of the segments relative to the ideal scan line of a playback head can be obtained.
• 7. Optimum robustness to tracking errors and missing trick play sync blocks is obtained.

It might It will be appreciated that the present invention is not limited to the specific ones trick play speeds described in the figure description limited. So can For example, trick play speeds of 6x, 18x and 36x in the forward and reverse direction chosen be combined with trick play information in groups of (p = 72) tracks is recorded. Furthermore, the present needs Invention is not limited to the recording of video data be. You could be yourself the application of the present invention to an audio recording system imagine, based on the helical scan method, with different Audio signals in the trick play segment for different trick play speeds to be recorded.

reference material

• D1 US 5,579,183 , corresponding EP 702,877-A2 (PHN 14.818)
• D2 WO 96 / 30.905-A2 (PHN 15.260)
• D3 US-A 5,142,421 (PHN 13,537)
• D4 WO 95/28061 (PHN 14.832)

Text in the drawing

1

• Track 0
• Lane 47

1a

• Track 0
• Lane 47

2

• margin
• preamble
• subcode
• postamble
• IBG
• preamble
• Auxiliary signal recording part
• postamble
• IBG
• preamble
• Main data area
• postamble
• margin

8th

• Main headboard
• dates
• Inner parity

3

• Lane 47

3a

• Track 0
• Lane 47

4a

• Track 0
• Lane 47

5a

• Track 0
• Lane 47

6a

• Track 0
• Lane 47

7a

• Track 0
• Lane 47

10

• main head
• packet header
• Inner parity
• transport package

11

• Normal playback time marker

12

• Trick play time marker

13

• microprocessor
• Normal playback processing
• Trick play processing
• Time stamp generator
• Subcode and auxiliary generator
• Synchronization and ID generator
• channel coding

14

• Oscillator counter
• frequency divider
• counter
• count down
• frequency divider
• counter
• count down
• frequency divider
• counter
• count down

15

• channel decoding
• Normal playback processing
• Trick play processing
• Band servo control means

Claims (48)

Apparatus for recording a first and a second digital information signal in oblique tracks on a magnetic recording medium ( 140 ) this device comprising the following elements: - input means ( 11 . 114 . 116 . 122 ) for receiving the first and second digital information signals, - signal processing means ( 124 . 126 . 130 . 132 . 134 ) for processing the first and the second digital signal into a first or second trick play signal, respectively, suitable for recording in the tracks, writing means for writing at a writing speed of the record carrier ( 140 ) Writing the first and second trick play signals to obtain the first and second trick play segments, respectively ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) at specific locations in said tracks, the writing means comprising at least a first and a second write head ( 142 . 144 ) on a rotatable head drum ( 146 ), wherein the first head has a gap with a first azimuth angle and the second head has a gap with a second azimuth angle which deviates from the first azimuth angle, the first digital information signal being meant to be reproduced in a playback device at a trick play speed allow corresponding to the n ₁ times the recording speed, the second digital information signal being meant for enabling a reproduction in said reproduction apparatus at a trick play reproduction speed which corresponds to the n ₂ times the recording speed, ₁ where n and n ₂ are integers, the mutually do not correspond to and are not 0 and 1, characterized in that the first and second trick play signals comprise sync blocks containing information about the first and second digital information signals, respectively, and the write means comprise the sync blocks of the first trick into a number of first trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) write the sync blocks of the second trick play signal into a number of second trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ), the sync blocks ( 3 , SB) in the trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) have first and second sync block numbers, respectively, wherein the first sync block number in a sync block has a relationship with the position of the sync block in the track, and the second sync block number does not have such a relationship with the sync block position in said track. Apparatus according to claim 1, wherein the writing means comprises a number of first trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) in each of the successive groups of p tracks to allow reproduction of m ₁ sync blocks of the first trick play signal at said trick play speed equal to n ₁ times the recording speed in said reproducing apparatus during a few turn of the head drum ( 146 ) in said reproducing apparatus, the reproducing apparatus comprising at least a first and a second read head ( 144 ) on said head drum ( 146 ), said first read head ( 142 ) has a gap with an azimuth angle substantially corresponding to said first azimuth angle, and wherein said second read head ( 144 ) has a gap with an azimuth angle substantially corresponding to said second azimuth angle, said writing means further comprising a number of second trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) in each of said group of p tracks for reproducing m ₁ sync blocks of the second trick play signal at said trick play speed equal to n ₂ times the recording speed during said one revolution of the head drum ( 146 ), where p is an even integer having a value greater than 1 and where m _{1 is} an integer greater than 1, the second sync block numbers in said m ₁ sync blocks of the first trick play signal being equivalent to a sequence of numbers running from a start number m ₀ , which is preferably zero, to a destination number m ₀ + m ₁ - 1, and wherein the second sync block numbers in said m ₁ sync blocks of the second trick play signal are equivalent to said sequence of numbers running from the Start number m ₀ , which is preferably zero, to the said target number m ₀ + m ₁ - 1. (v = + 4x and V = -4x) Apparatus according to claim 2, wherein said writing means divides said m ₁ sync blocks of the first trick play signal into two first trick play segments ( 22.i (+ 4) ), where m _{1 is} an even integer and where each of the first two trick play segments ( 22.i (+ 4) ) M _1/2 sync blocks of the first trick play signal comprising. An apparatus according to claim 3, wherein m ₄ sync blocks of the m _1/2 sync blocks in each of the first trick play segments ( 22.i (+ 4) Has) parity information, wherein m ₄ is an integer <m _1/2, said m in general contains ₄ sync blocks does not form part of the first digital information signal, wherein the m is _1/2 - m ₄ other sync blocks in one of the two first trick play segments ( 22.i (+ 4) Having) the second sync block sequence numbers equivalent to a sequence of numbers running from m ₀ to m ₀ + m is _1/2 - m ₄ - 1 and m is _1/2 - m ₄ other sync blocks in the other segment of the first two trick play segments ( 22.i (+ 4) ) Second sync block sequence numbers has, equivalent to a sequence of numbers running from m ₀ + m _1/2 - m ₄ to m ₀ + m ₁ - m 2 x ₄ - 1. (v = + 4x) An apparatus according to claim 4, wherein (a) the second sync block numbers of the m ₄ sync blocks having parity information and provided in said first trick play segment are equivalent to a sequence of numbers running from m ₀ + m ₁ - 2xm ₄ to m ₀ + m ₁ - m ₄ - 1, and wherein: (b) the second sync block numbers of the m ₄ sync blocks with parity information and provided in the other first trick play segment are equivalent to a sequence of numbers running from m ₀ + m ₁ - m ₄ to m ₀ + m ₁ - 1. (v = + 4x) An apparatus according to claims 3, 4 or 5, wherein during reproduction at said trick play speed corresponding to n ₁ times recording speed in said reproducing apparatus, said first trick play segment having said sync block has a second sync block number equal to number m ₀ , as the first of the first two trick play segments ( 22.i (+ 4) ) from one of the two read heads ( 252 . 254 ) during said one revolution of the head drum ( 146 ), the other first trick play segment being subsequently read by the other of said two read heads ( 252 . 254 ) during said rotation of the head drum ( 146 ) should be read. (v = +4) Apparatus according to claim 2, wherein said writing means divides said sync blocks of said second trick play signal into four second trick play segments (12). 28.i (-4) ), each of the four second trick play segments ( 28.i (-4) ) has (m ₁ ) / 4 sync blocks of the second trick play signal while m _{1 is} a multiple of 4. (v = -4x) An apparatus according to claim 7, wherein (m ₄ - 1) / 2 sync blocks of the m _1/4 sync blocks in each of the two trick play segments ( 28.1 (-4) Containing) parity information wherein the (referred m ₄ - 1) / 2 sync blocks do not contain any part of the second digital information signal, wherein (m ₄ +1) / 2 sync blocks of the m _1/4 sync blocks in each of the other two second trick play segments ( 28.i (-4) ) Contain parity information, said (m ₄ + 1) / 2 sync blocks containing no part of the second digital signal at all. Apparatus according to claim 8, wherein the other synchronization blocks in one of the second trick play segments ( 28.i (-4) ) Comprise second sync block sequence numbers that are equivalent to a sequence of numbers that either m ₀ to m ₀ + m is _1/4 - (m ₄ - 1) / 2 - 1 or m ₀ + m is _1/4 - (m ₄ + 1) / 2 - 1, with the other synchronization blocks in a second segment of the four second trick play segments ( 28.i (-4) ) Have second sync block sequence numbers that are equivalent to a sequence of numbers from either m ₀ + m _1/4 - (m ₄ - 1) / 2 or from m ₀ + m _1/4 - (m ₄ +1) / 2, with the other synchronization blocks in a third segment of the four second trick play segments (FIG. 28.i (-4) ) Have second sync block sequence numbers that are equivalent to a sequence of numbers, the m _1/2 from m ₀ + either m ₀ + 3XM _1/4 - (3XM ₄ - 1) / 2 - 1 or m ₀ + 3XM ₁ / 4 - (3xm ₄ + 1) / 2 - 1 and where the other sync blocks in the fourth segment of the four trick play segments ( 28.i (-4) ) Sync block sequence numbers have that are equivalent to a sequence of numbers, the m of either ₀ + 3XM _1/4 - (3XM ₄ - 1) / 2 or from m ₀ + 3XM _1/4 - (3XM ₄ + 1) / 2 to m ₀ + m ₁ - 2xm ₄ - 1 run. (v = -4x) Apparatus according to claim 9, wherein (a) the parity information synchronization blocks in the first segment of the four second tricks besegmente ( 28.i (-4) ) have second sync block numbers, equal to the numbers m ₀ + m ₁ - 2xm ₄ to either m ₀ + m ₁ - (3xm ₄ - 1) or to m ₀ + m ₁ - (3xm ₄ + 1) / 2 - 1, (b) the parity information synchronization blocks in the second segment of the four second trick play segments ( 28.i (-4) ) have second synchronization block numbers equal to the numbers of either m ₀ + m ₁ - (3xm ₄ - 1) / 2 or m ₀ + m ₁ - (3xm ₄ + 1) / 2 to m ₀ + m ₁ - m ₄ - 1, (c) the parity information synchronization blocks in the third segment of the four second trick play segments (FIG. 28.i (-4) ) have second synchronization block numbers equal to the numbers from m ₀ + m ₁ - m ₄ to either m ₀ + m ₁ - (m ₄ - 1) / 2 - 1 or m ₀ + m ₁ - (m ₄ + 1) / 2-1, and (d) the parity information synchronization blocks in the fourth segment of the four second trick play segments (FIG. 28.i (-4) ) have second synchronization block numbers equal to the numbers of either m ₀ + m ₁ - (m ₄ - 1) / 2 or m ₀ + m ₁ - (m ₄ + 1) / 2 to m ₀ + m ₁ - 1. v = -4x) Device according to one of claims 1 to 10, characterized in that m ₁ = 100. Apparatus according to any one of claims 1 to 10, wherein n ₁ = 4. Apparatus according to any one of claims 1 to 10, wherein n ₂ = -4. Apparatus according to claim 1, wherein the writing means comprises a number of first trick-playing segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) in each of the successive groups of p tracks for reproducing m ₁ sync blocks of the first trick play signal at said trick play speed equal to n ₁ times the record speed in said reproducing apparatus during one revolution of the head drum ( 146 ) is possible in the said reproducing apparatus, the reproducing apparatus comprising at least a first and a second read head ( 142 . 144 ) on said head drum ( 146 ), said first read head ( 142 ) has a gap with an azimuth angle substantially corresponding to said first azimuth angle and the second read head ( 144 ) has a gap with an azimuth angle substantially equal to said second azimuth angle, said writing means further comprising a number of second trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) in each of said groups of p tracks for reproducing m ₁ sync blocks of the second trick play signal at said trick play speed equal to n ₂ times the recording speed during said one revolution of the head drum ( 146 ), where p is an even integer greater than 1, and where m _{1 is} an integer greater than 1, said m ₁ sync blocks of the first trick play signal m ₁ / q ₁ having original sync blocks of the first trick play signal, and q ₁ - 1 repetitions of each of the m ₁ / q ₁ original sync blocks, said ml sync blocks of the second trick play signal m ₁ / q ₁ containing original sync blocks of the second trick play signal and q ₁ - 1 repeats of each of the m ₁ / q ₁ original sync blocks. Apparatus according to claim 14, wherein said second sync block numbers in said m ₁ / q ₁ original sync blocks of said first trick play signal are equivalent to a sequence of numbers ranging from a start number m ₀ , which is preferably zero, to a destination number m ₀ + m ₁ / q ₁ - 1, the second sync block numbers in said m ₁ / q ₂ original sync blocks of said second trick play signal being equivalent to a sequence of numbers from said start number m ₀ , which is preferably zero, to a destination number m ₀ + m ₁ / q ₂ - 1, where q ₁ and q _{2 are} integers greater than 1 and that m _{1 is} a whole multiple of q ₁ and q ₂ . (v = + 12x and v = -12x or + 24x and -24x) An apparatus according to claim 14 or 15, wherein the second sync block numbers of each of the m ₁ / q ₁ original sync blocks of the first trick play signal are the same as the second sync block numbers of its repetitions and wherein the second sync block numbers of each of the m ₁ / q ₂ original sync blocks of the second trick play signal are also the same Like the second sync block numbers, they are their repetitions. An apparatus according to claim 14, 15 or 16, wherein said writing means stores sync blocks of said first trick play signal into said number of first trick play segments (12). 34.i (+12) . 40.i (-12) . 48.i (+24) . 45.I (-24) ) in said group of p consecutive tracks for reading out eight first segments during said one revolution of the rotary head drum ( 146 ) at the said trick play speed corresponding to n ₁ times the recording speed, each of the six of the eight first trick play segments ( 34.i (+12) ) (m ₁ - 4) / 8 has sync blocks of the first trick play video signal and each of the other two of the first trick play segments ( 34.i (+12) ) has (m ₁ +12) / 8 sync blocks of the first trick play video signal. (v = + 12x) An apparatus according to claim 16, wherein the writing means inputs the m ₁ / qi original sync blocks of the first trick play signal at such positions into the eight first trick play segments (Fig. 34.i (+12) ), thereby offering the possibility, when playing at said trick play speed equal to n ₁ times the recording speed, of initial sync blocks with second sync. block numbers m ₀ to m ₁ / 2q ₁ - 1, first with the first read head ( 142 ) and the original synchronization blocks with the second synchronization block numbers m ₀ + m ₁ / 2q ₁ to m ₀ + m ₁ / q ₁ - 1 thereafter with said second read head ( 144 ) during a single revolution of the head drum ( 146 ) read out. (v = +12) Apparatus according to claim 18, wherein each of said eight first trick play segments ( 34.i (+12) ) comprises a number of said original sync blocks of said first trick play signal and said q ₁ - 1 repeats each of said number of original sync blocks. (v = + 12x) An apparatus according to claim 14, 15 or 16, wherein said writing means includes sync blocks of said second trick play signal into said number of second trick play segments (16). 40.i (-12) ) in the said group of p consecutive tracks, so that the reading out of nine second trick play segments ( 34.i (+12) ) during said one revolution of the rotatable head drum ( 146 ) at said trick play speed, corresponding to n ₂ times the recording speed, and wherein each segment of the nine second trick play segments ( 40.i (-12) ) M _1/9 sync blocks of the second trick play signal having. Apparatus according to claim 20, wherein the i. second trick play segment includes original sync blocks of the second trick play signal having second sync block numbers which are equivalent to a sequence of numbers running from m ₀ + (i-1) m ₁ / 9q ₂ to m ₀ + ixm ₁ / 9q ₂ -1 i is an integer running from 1 to 9, and where m _{1 is} a whole multiple of 9q ₂ . (v = -12x) Apparatus according to claim 21, wherein each segment of said nine second trick play segments ( 40.i (-12) ) comprises a repetition of the original sync blocks of the second trick play video signal located in said second trick play segment, the second sync block numbers of the original sync blocks in a second trick play segment being the same as the second sync block numbers of its repetitions. (v = -12x) Apparatus according to claim 21, wherein said writing means comprises said nine second trick play segments ( 40.i (-12) ) at such a position into said group of p lanes that, during a reproduction at said speed corresponding to n ₂ times the recording speed, said first mentioned second trick play segment with synchronization blocks having second synchronization burst numbers equal to the numbers m ₀ to read m ₀ + m ₁ / 9q ₁ - 1 first, said second, third and fourth second trick play segments ( 40.i (-12) ) with one of the two reading heads ( 252 . 254 ), wherein the fifth second trick play segment is thereafter read with either said one head or the other head, and the sixth, seventh, eighth, and ninth second trick play segments ( 40.i (-12) ) with the said other head of the two reading heads ( 252 . 254 ) during said one revolution of the head drum ( 146 ) read out. (v = -12x) Apparatus according to any one of claims 1 or 14 to 23, wherein m ₁ = 180. Apparatus according to any one of claims 1 or 14 to 23, wherein n ₁ = 12. Apparatus according to any one of claims 1 or 14 to 23, wherein n ₂ = -12. Apparatus according to any one of claims 1 or 14 to 23, wherein q ₁ = 2. Apparatus according to any one of claims 1 or 14 to 23, wherein q ₂ = 2. Apparatus according to claim 14, 15 or 16, wherein the writing means comprise synchronization blocks of the first Wie output signal into said number of first trick play segments ( 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) in the said group of p consecutive tracks, so that the reading out of 18 first display segments during said one revolution of the rotatable head drum ( 146 ) at the said trick play speed corresponding to n ₁ times the recording speed, each of the 18 first trick play segments ( 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) M _1/18 sync blocks of the first trick play signal contains. Apparatus according to claim 29, wherein the i. first trick play segment original sync blocks contains the first trick play signal having second sync block sequence numbers equivalent to a sequence of numbers from m ₀ + (i - 1) m ₁ / 18q ₁ to m ₀ + i xm _{1/18 q1} - run 1, wherein i is an integer from 1 to 18 and where m _{1 is} a whole multiple of 18 _q1 . (v = + 24x) Apparatus according to claim 30, wherein each segment of said 18 first trick play segment (s) ( 48.i (+24) ) has a duplicate repetition of the original sync blocks of the first trick play signal in said one first trick play segment, the second sync block numbers of the original sync blocks in a first trick play segment being the same as the second sync sequential numbers of their repetition. (v = + 24x) An apparatus according to claim 14, 15 or 16, wherein said writing means includes sync blocks of said second trick play signal into said number of second trick play segments (16). 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) in said group of p consecutive tracks for reading out 18 second display segments during said one revolution of the rotatable head drum ( 146 ) at the said trick play speed, corresponding to n ₂ times the recording speed, each of the 18 second trick play segments ( 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) M _1/18 sync blocks of the second trick play signal having. Apparatus according to claim 32, wherein the i. having second trick play segment original sync blocks having second sync block sequence numbers that are equivalent to a sequence of numbers from m ₀ + (i - 1) m ₁ / 18q ₂ to m ₀ + i xm _{1/18 q2} - run 1, wherein all the i a Number is running from 1 to 18, and where m _{1 is} a whole multiple of 10q ₂ . (v = -24x) Apparatus according to claim 33, wherein each of said 18 second trick play segments ( 54.i (-24) ) has a duplicate repetition of the original sync blocks of the second trick play signal in said one second trick play segment, the second sync block numbers of the original sync blocks in a second trick play segment being the same as the second sync block sequence numbers of which are repetitions. (v = -24x) Apparatus according to any one of claims 1 or 29 to 34, wherein m ₁ = 270. Apparatus according to any of claims 1 or 29 to 34, wherein n ₁ = 24. Apparatus according to any one of claims 1 or 29 to 34, wherein n ₂ = -24. Apparatus according to any one of claims 1 or 29 or 34, wherein q ₁ = q ₂ = 3. device according to one of the preceding claims, wherein the trick play sync blocks a Synchronous word part, an identification part, a header and a Data part, wherein the second synchronization block sequence number is stored in the header. device according to claim 39, wherein the header has at least two bytes and the second sync block number in the second byte of the header is stored. device according to claim 40, wherein the second synchronization block number is a 6-bit word, that in the 6 least significant bits the second byte of the header is stored. The apparatus of claim 41, wherein m ₁ = 90, wherein the second sync block number corresponds to the count number if the count number is less than a first whole constant less than 64, and the sync block is provided in a trick play segment associated with the first Otherwise, the second sync block number of the count number is less than a second whole constant. device according to claim 42, wherein for the second whole constant the following relation applies: 36 second whole constant 90 less of the first whole constant. Apparatus according to claim 42 or 43, wherein the first whole constant 50 corresponds and the second whole constant is equal to 40. Apparatus according to claim 1, wherein said writing means divides the synchronization blocks of the first trick play signal into a number of first trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) in a group of p consecutive tracks. Apparatus according to claim 45, wherein the writing means comprises a number of first trick play segments ( 22.i (+ 4) . 28.i (-4) ) in each group of consecutive groups of p tracks for reproducing m ₁ sync blocks of the first trick play signal at said trick play speed corresponding to n ₁ times the recording speed in said reproducing apparatus during one revolution of the head drum ( 146 ) in said reproducing apparatus, the reproducing apparatus comprising at least a first and a second reading head ( 144 ) on said head drum ( 146 ), said first read head ( 142 ) has a gap with an azimuth angle substantially equal to said first azimuth angle, and wherein the second read head ( 144 ) has a gap with an azimuth angle substantially equal to said second azimuth angle, where p is an even integer greater than 1 and where m _{1 is} an integer greater than 1, the second sync block numbers in said m ₁ sync blocks of the first trick play signal are equivalent to a sequence of numbers that run from a start number m ₀ , which is preferably zero, to a destination number m ₀ + m ₁ -1. (v = + 4x and v = -4x) Apparatus according to claim 45, wherein said writing means comprises a number of first trick play segments ( 34.i (+12) . 40.i (-12) ) in each group of consecutive groups of p tracks for reproducing m ₁ sync blocks of the first trick play signal at said trick play speed corresponding to n ₁ times the recording speed in said reproducing apparatus during one revolution of the head drum ( 146 ) in said reproducing apparatus, the reproducing apparatus comprising at least a first and a second reading head ( 144 ) on said head drum ( 146 ), said first read head ( 142 ) has a gap with an azimuth angle substantially corresponding to the said first azimuth angle and the second read head (US Pat. 144 ) has a gap with an azimuth angle substantially equal to said second azimuth angle, where p is an even integer greater than 1 and where m _{1 is} an integer greater than 1, said m ₁ sync blocks of the first trick play signal m ₁ / q ₁ original sync blocks of the first trick play signal and q ₁ - 1 repeats of each of the m ₁ / q ₁ original sync blocks. (v = + 12x and v = -12x) Method for recording a first digital information signal in oblique tracks on a magnetic recording medium ( 140 ), the method comprising the following method steps: - receiving the first and the second digital information signal, - processing the first digital signal into a first trick play signal suitable for recording in the tracks, - the writing speed of the record carrier ( 140 ) Writing the first trick play signal to obtain first trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) at specific locations in said tracks, using writing means comprising at least a first and a second write head ( 142 . 144 ) on a rotatable head drum ( 146 ), wherein the first head has a gap with a first azimuth angle and the second head has a gap with a second azimuth angle which deviates from the first azimuth angle, the first digital information signal being meant to be reproduced in a playback device at a trick play speed allow corresponding to the n ₁ times the recording speed, where ₁ n is an integer equal to 0 and 1, is characterized in that the processing step comprises generating the first trick play signal comprising sync blocks that contain information about the first digital information signal, and that the sync blocks of the first trick play signal into a number of first trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) are written in a group of p consecutive tracks ( 2 ), with the synchronization blocks in the trick play segments ( 22.i (+ 4) . 28.i (-4) . 34.i (+12) . 40.i (-12) . 48.i (+24) . 54.i (-24) ) have a first and a second sync block number, the first sync block number in a sync block having a relationship with the position of the sync block in a track, and the second sync block number having no relation whatsoever to the position of the synchro nisationsblocks in said track has.